The following is a timeline of intersex history.
- Sumerian creation myths, 4000 years ago, included the fashioning of a body with atypical sex characteristics.
- Hippocrates and Galen viewed sex as a spectrum between men and women, with "many shades in between, including hermaphrodites, a perfect balance of male and female".
- Aristotle viewed hermaphrodites as having "doubled or superfluous genitals".
2nd century BCEEdit
- Callon of Epidaurus undergoes surgery on ambiguous genitalia, described by Diodorus Siculus.
- Diophantus of Abae socially transitions and joins army of Alexander Balas.
1st century BCEEdit
- Diodorus Siculus described the god Hermaphroditus, "born of Hermes and Aphrodite", as having "a physical body which is a combination of that of a man and that of a woman"; he also reported that such children born with such traits were seen as prodigies, able to foretell future events.
43 BCE – 17/18 CEEdit
23 – 79 CEEdit
- Pliny the Elder described "those who are born of both sex, whom we call hermaphrodites, at one time androgyni" (andr-, "man," and gyn-, "woman," from the Greek).
c.80 – 160 CEEdit
- Sophist philosopher Favorinus of Arelate was described as being a eunuch (εὐνοῦχος) by birth. Mason and others describe Favorinus as having an intersex trait.
- Augustine wrote in The Literal Meaning of Genesis that humans were created in two sexes, despite "as happens in some births, in the case of what we call androgynes".
- According to the Canon law Decretum Gratiani, "Whether an hermaphrodite may witness a testament, depends on which sex prevails" (Hermafroditus an ad testamentum adhiberi possit, qualitas sexus incalescentis ostendit.)
- Peter Cantor a French Roman Catholic theologian when writing about sodomy in the De vitio sodomitico wrote “the church allows the hermaphrodite to use the organ by which s/he is most aroused. But should s/he fail with one organ the use of the other can never be permitted and s/he must remain perpetually celibate to avoid any similarity to the role inversion of sodomy, which is detested by God.” 
- In his "Chronicle, or History of the Two Cities", Otto of Friesing described hermaphrodites as "a mistake of nature", "grouped together with other supposed defects of the body, such as short stature, dark 'Ethiopian' skin, and lameness".
- Gerald of Wales in Topography of Ireland stated “Also, within our time, a woman was seen attending the court in Connaught, who partook of the nature of both sexes, and was a hermaphrodite."
- Canon lawyer Henry of Segusio argued that a "perfect hermaphrodite" where no sex prevailed should choose their legal gender under oath.
- Henry de Bracton's De Legibus et Consuetudinibus Angliae ("On the Laws and Customs of England", c.1235) classified mankind as "male, female, or hermaphrodite", and a "hermaphrodite is classed with male or female according to the predominance of the sexual organs."
- The Hereford Mappa Mundi (c.1300) includes a hermaphrodite, outside the borders of the world known to its makers.
- English jurist and judge Edward Coke (Lord Coke), wrote in his Institutes of the Lawes of England (1628 – 1644) on laws of succession: "Every heire is either a male, a female, or an hermaphrodite, that is both male and female. And an hermaphrodite (which is also called Androgynus) shall be heire, either as male or female, according to that kind of sexe which doth prevaile." The Institutes are widely held to be a foundation of common law.
- 17th-century historical accounts include Eleno de Céspedes, in Spain.
- Thomas(ine) Hall (born c. 1603) in the United States, was ruled to have a "dual-nature" gender by colonial Virginia governor John Pott.
1755 – after 1792Edit
- Spanish nun Fernanda Fernández was found to have an intersex trait and subsequently reclassified male.
1763/1764 – 1832Edit
- Vietnamese general Lê Văn Duyệt helped to unify Vietnam.
- 17-year-old Rosa Mifsud appeared before a Maltese court after petitioning for a change in sex classification from female. Two clinicians performed an examination and found that "the male sex is the dominant one". The petition was appealed and granted.
- Anglo-Welsh philologist William Jones published an English translation of Al Sirájiyyah: The Mohammedan Law of Inheritance which detailed inheritance rights for hermaphrodites in Islam.
- The General State Laws for the Prussian States (Allgemeines Landrecht für die Preußischen Staaten) granted hermaphrodites the right to choose their sex at the age of 18, if the sex of rearing proved to be wrong. In force until 1900 when the Bürgerliches Gesetzbuch became effective.
1798 – unknownEdit
- German intersex man Gottlieb Göttlich became famous as a travelling medical case.
- Levi Suydam was an intersex person in Connecticut whose capacity to vote in male-only elections was questioned in 1843.
1838 – 1868Edit
- Herculine Barbin wrote memoirs that were later published by Michel Foucault. Barbin was reassigned male against her wishes after clinical and legal examination. Her birthday is marked in Intersex Day of Remembrance on 8 November.
- The Welshman newspaper published an account of a child on November 7.
- During the Victorian era, medical authors introduced the terms "true hermaphrodite" for an individual who has both ovarian and testicular tissue, verified under a microscope, "male pseudo-hermaphrodite" for a person with testicular tissue, but either female or ambiguous sexual anatomy, and "female pseudo-hermaphrodite" for a person with ovarian tissue, but either male or ambiguous sexual anatomy.
- The Cambrian newspaper in Wales published an article on the death in Cardiff of an intersex child who, at post-mortem examination, was determined to be a girl.
- Polish gynecologist Franciszek Ludwik Neugebauer published a compendium with more than 750 pages of case studies, often with photos, covering the preceding 20 years. This included surgery performed at the beginning of the 20th century by Emil Zuckerkandl in Vienna.
- The terms 'intersex' for the individual and 'intersexuality' for the phenomenon were coined in the German language by endocrinologist Richard Goldschmidt after studies on gypsy moths. One year later, Goldschmidt used the term to describe pseudohermaphroditism in humans.
- The term 'intersex' was introduced as the (contested) medical diagnosis "Weib intersexuellen Typus" ("intersex type woman") by Austrian gynecologist and obstetrician Paul Mathes  His book was published after his death, in 1924.
- By 1930, the term 'intersex' had already been widely used in medicine in Germany as a new term for "Scheinzwitter" (pseudohermaphrodite), and doctors reported numerous different procedures of intersex surgery.
- The German gynecologist and obstetrician Hans Naujoks performed what was described as the first complete and comprehensive intersex surgery and hormone treatment on a patient with both ovarian and testicular tissue, at the University of Marburg. The female patient was described as fully functional after surgery and, starting in 1934, spontaneously menstruated.
- The geneticist and leading German race theorist Fritz Lenz called for more intersex research, especially on twins.
- The ethnic Sinti Auschwitz survivor Hugo Höllenreiner was genitally injured at the age of 9 during medical experiments carried out by war criminal Josef Mengele. Höllenreiner witnessed that he was one of Mengele's many candidates for forced sex change but did not receive full surgery.
- The first suggestion to replace the term 'hermaphrodite' with 'intersex', in medicine, came from British physician Cawadias in 1943. This was taken up by other physicians in the United Kingdom during the 1960s.
- The first intersex surgery of a child was performed at the Children's Hospital of the University of Zurich (Kinderspital Zürich). The girl suffered from CAH and her clitoris was amputated at the age of seven. She received hormones in 1951. Between 1944 and 1947, three girls had their clitorises amputated.
- In July, the first mandatory sex verification tests in sports were issued by the International Association of Athletics Federations (IAAF) for woman athletes. All athletes were tested in their own countries.
- John Money was awarded a PhD by Harvard University, entitled Hermaphroditism: An Inquiry into the Nature of a Human Paradox.
- The botched circumcision of David Reimer was followed by sex reassignment in line with theories on optimal gender and gender identity formation by John Money. The case of David Reimer became known as the "John/Joan case" and it supported early interventions on the bodies of intersex infants.
- Chromosomal sex verification testing in sport was introduced by the International Olympic Committee, at the Mexico City Olympics.
- The Family Court of Australia annulled the marriage of an intersex man who had been "born a male and had been reared as a male" and subjected to "normalizing" medical interventions, on the basis that he was an hermaphrodite.
- Former Polish Olympic track athlete Stanisława Walasiewicz (Stella Walsh) was killed during an armed robbery in a parking lot in Cleveland, Ohio, on 4 December 1980. She was found to have intersex traits.
- The Androgen Insensitivity Syndrome Support Group Australia (AISSGA) was founded, thought to be the first intersex civil society organization.
- Spanish hurdler Maria José Martínez-Patiño was dismissed from competing after she failed a chromosomal test.
- The IAAF ceased sex screening for all athletes, but retained the option of assessing the sex of participants.
- The Intersex Society of North America (ISNA) was founded by Cheryl Chase and others. Chase announced the organization in a letter to The Sciences. ISNA was active until 2008.
- The first public demonstration by intersex people, in Boston on October 26. Morgan Holmes, Max Beck and friends demonstrated outside a venue in Boston where the American Academy of Pediatrics was holding its annual conference. The event is now commemorated by Intersex Awareness Day.
- Milton Diamond and Keith Sigmundson published a paper discrediting John Money and his optimal gender model, after tracking down David Reimer.
- In Sentencia SU-337/99 and then Sentencia T-551/99, the Constitutional Court of Colombia restricted medical interventions on intersex children aged over five years.
- The term endosex was coined as an opposite or antonym to the term intersex, by Heike Bödeker, Germany.
- Indian athlete and swimmer Pratima Gaonkar commits suicide after disclosure and public commentary on a failed sex verification test.
- Australian Alex MacFarlane believed to be the first person in Australia to obtain a birth certificate recording sex as indeterminate, and the first Australian passport with an 'X' sex marker.
- In South Africa, the Judicial Matters Amendment Act, 2005 (Act 22 of 2005) amended the Promotion of Equality and Prevention of Unfair Discrimination Act, 2000 (Act 4 of 2000) to include intersex within its definition of sex, due in part to the work of Sally Gross.
- The Human Rights Commission of the City and County of San Francisco publishes the first report on the treatment of intersex people by a human rights institution, entitled A Human Rights Investigation Into The Medical "Normalization" Of Intersex People.
- Publication of the Yogyakarta Principles on the Application of International Human Rights Law in relation to Sexual Orientation and Gender Identity included Principle 18 on Protection from Medical Abuses, including "all necessary legislative, administrative and other measures to ensure that no child's body is irreversibly altered by medical procedures in an attempt to impose a gender identity without the full, free and informed consent of the child". Intersex and transgender activist Mauro Cabral was the only intersex signatory to the Principles.
- The medical Consensus statement on management of intersex disorders was published, changing clinical language from intersex to disorders of sex development.
- Indian middle-distance runner Santhi Soundarajan won the silver medal in 800 m at the 2006 Asian Games in Doha, Qatar, then failed a sex verification test and was stripped of her medal.
- South African middle-distance runner Caster Semenya won the 800 meters at the 2009 World Championships in Athletics in Berlin. After her victory at the 2009 World Championships, it was announced that she had been subjected to sex verification testing, bringing intersex issues to the public eye. On July 6, 2010, the IAAF confirmed that Semenya was cleared to continue competing. The results of the testing were never officially released for privacy reasons and her personal status is unknown.
- In the Kenyan High Court case of Richard Muasya v. the Hon. Attorney General, Muasya had been convicted of robbery with violence. The case examined whether or not he had suffered discrimination as a result of being born intersex. He was found to have been subjected to inhuman and degrading treatment while in prison. The Court also determined that he had not suffered from lack of identification documents, but was responsible for registering his own birth, following a failure to do so at the time of his birth.
- Christiane Völling became the first intersex person known to have successfully sued for damages in a case brought for non-consensual surgical intervention.
- Tony Briffa, believed to be the world's first intersex mayor, was elected in the City of Hobsons Bay in the suburbs of Melbourne, Australia, at the end of November.
- The first International Intersex Forum was held, in Brussels.
- The Swiss National Advisory Commission Biomedical Ethics published a report on the management of differences of sex development.
- On November 14, 2012, the Supreme Court of Chile sentenced Maule Health Service for "lack of service" and to pay compensation of 100 million pesos for moral and psychological damages caused to a child, Benjamín, and another 5 million for each of his parents, following surgery without informed consent.
- On 1 February, Juan E. Méndez, the UN Special Rapporteur on torture and other cruel, inhuman or degrading treatment or punishment, issued a statement condemning non-consensual surgical intervention on intersex people.
- Patrick Fénichel, Stéphane Bermon and other clinicians disclosed that four elite female athletes from developing countries were subjected to partial clitoridectomies and gonadectomies (sterilization) after testosterone testing revealed that they had the intersex condition 5-alpha-reductase deficiency.
- In June, Australia passed legislation protecting intersex people from discrimination on grounds of "intersex status".
- In October, the Council of Europe adopted a resolution 1952, Children's right to physical integrity.
- Also in October, the Australian Senate became the first parliamentary body to publish an inquiry into the involuntary or coerced sterilization of intersex people, entitled Involuntary or coerced sterilisation of intersex people in Australia.
- Intersex activists testified for the first time before the Inter-American Commission on Human Rights.
- Germany passed a law requiring intersex infants who may not be classed as male or female to be assigned as "indeterminate". The move is criticized by civil society organizations and human rights institutions as not based around principles of self-determination.
- In December, participants at the Third International Intersex Forum published the Malta declaration.
- The High Court of Kenya ordered the Kenyan government to issue a birth certificate to a five-year-old child born in 2009 with ambiguous genitalia.
- The World Health Organization and other UN agencies published a joint statement against coercive sterilization.
- Malta became the first country to outlaw non-consensual medical interventions to modify sex anatomy, including that of intersex people. In the same law, it also becomes the first jurisdiction to protect intersex and other people from discrimination on grounds of "sex characteristics".
- The Commissioner for Human Rights of the Council of Europe called for recognition of a right to not undergo sex affirmation interventions.
- In July, policies on sex verification in sport excluding women with hyperandrogenism were suspended following the case of Dutee Chand v. Athletics Federation of India (AFI) & The International Association of Athletics Federations, in the Court of Arbitration for Sport.
- Michaela Raab successfully sued doctors in Nuremberg, Germany who failed to properly advise her. Doctors stated that they "were only acting according to the norms of the time." On 17 December 2015, the Nuremberg State Court ruled that the University of Erlangen-Nuremberg Clinic must pay damages and compensation.
- The Astraea Lesbian Foundation for Justice established the first Intersex Human Rights Fund, in an attempt to address resourcing issues.
- The Ugandan Registration of Persons Act 2015 allowed for the birth registration of a child born a "hermaphrodite", and for children's change of name and change of sex classification. Many adult intersex persons were understood to be stateless due to historical difficulties in obtaining identification documents.
- In January, the Ministry of Health of Chile ordered the suspension of unnecessary normalization treatments for intersex children, including irreversible surgery, until they reach an age when they can make decisions on their own. This was overturned in August 2016.
- In October, the United Nations, African Commission on Human and Peoples' Rights, Inter-American Commission on Human Rights, Council of Europe Commissioner for Human Rights and other global experts on human rights and child rights called for an urgent end to violence and harmful practices on intersex children and adults.
- In October, the United Nations Office of the High Commissioner for Human Rights launched a website on intersex human rights entitled United Nations for Intersex Awareness.
- Research suggested that there has been no reduction in number of intersex medical interventions in Germany over the period since 2005.
- The French Senate published the second parliamentary inquiry into the wellbeing and rights of intersex people. On 17 March 2017, the president of the Republic, François Hollande, described medical interventions to make the bodies of intersex children more typically male or female as increasingly considered to be mutilations.
- In March 2017, representatives of Androgen Insensitivity Syndrome Support Group Australia, Intersex Trust Aotearoa New Zealand, and Organisation Intersex International Australia published an Australian and Aotearoa/New Zealand consensus "Darlington Statement", calling for legal reform, including the criminalization of deferrable intersex medical interventions on children, an end to legal classification of sex, and improved access to peer support.
- Following a European conference in March, the Vienna Statement was published. It called for an end to human rights violations, and recognition of rights to bodily integrity, physical autonomy and self-determination.
- In April, the fourth International Intersex Forum was held in the Netherlands.
- In May, Amnesty International published a report condemning "non-emergency, invasive and irreversible medical treatment with harmful effects" on children born with variations of sex characteristics in Germany and Denmark.
- In June, Joycelyn Elders, David Satcher, and Richard Carmona, three former Surgeons General of the United States published a paper calling for a rethink of early genital surgeries on children with intersex traits stating "Those whose oath or conscience says “do no harm” should heed the simple fact that, to date, research does not support the practice of cosmetic infant genitoplasty."
- In July, Human Rights Watch and interACT published a report on medically unnecessary surgeries on intersex children in the U.S., “I Want to Be Like Nature Made Me”, based on interviews with intersex persons, families and physicians.
- The U.S. legal case M.C. v. Aaronson was settled out of court.
- The Yogyakarta Principles plus 10 were published, applying international human rights law in relation to sex characteristics, in addition to sexual orientation, gender identity and gender expression. Intersex signatories include Mauro Cabral Grinspan, Morgan Carpenter and Kimberly Zieselman.
- In November, Betsy Driver became the first intersex person openly elected to public office in the United States.
- In December, African intersex activists published a statement setting out local demands.
- In February, Asian intersex activists published the Statement of Intersex Asia and the Asian Intersex Forum, setting out local demands.
- In April, Latin American and Caribbean intersex activists published the San José de Costa Rica statement, defining local demands.
- On August 15, the German cabinet announced a law to create a new sex designation "diverse" on Vital Records for intersex people who cannot be clearly assigned either male or female at birth.  This complies with an Order of the Federal Constitutional Court. LGBT activists say that the law would be failing to make this category available to non-intersex people, and failing to address concerns about medical interventions.
- On August 28, California became the first U.S. state to condemn nonconsensual surgeries on intersex children, in Resolution SCR-110.
- On 1 May, the Court of Arbitration for Sport rejected a challenge by Caster Semenya to IAAF rules requiring the medicalization of women with particular “differences of sex development”, high testosterone and androgen sensitivity in sport, paving the way for the new rules to come into effect on 8 May 2019. During the legal challenge by Semenya, the IAAF changed the regulations to exclude from the regulations high testosterone associated with XX sex chromosomes. Semenya appealed the decision to the Federal Supreme Court of Switzerland.
- In May 2019, more than 50 intersex-led organizations signed a multilingual joint statement condemning the introduction of "disorders of sex development" language into the International Classification of Diseases, stating that this causes "harm" and facilitates human rights violations, calling on the World Health Organization to publish clear policy to ensure that intersex medical interventions are "fully compatible with human rights norms".
- In June 2019, an as-widely signed statement from the intersex groups and their allies condemned the positions on intersex issues of the text “Male and Female He Created Them”, Towards a Path of Dialogue on the Question of Gender Theory in Education,</ref> by the Congregation for Catholic Education.
- In July 2020, Lurie Children's Hospital because the first hospital in the United States to stop performing medically unnecessary cosmetic surgeries in intersex infants and publicly apologized to those harmed by past surgeries.
- In October 2020, Boston Children's hospital announced that they would stop performing clitorplasties and vaginoplasties in intersex infants and wait until the patient can meaningfully participate in conversations about risks and benefits of the procedure and give consent.
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