|Ab urbe condita||1685|
|Balinese saka calendar||853–854|
|Chinese calendar||辛卯年 (Metal Rabbit)|
3628 or 3568
— to —
壬辰年 (Water Dragon)
3629 or 3569
|- Vikram Samvat||988–989|
|- Shaka Samvat||853–854|
|- Kali Yuga||4032–4033|
|Japanese calendar||Jōhei 2|
|Minguo calendar||980 before ROC|
|Seleucid era||1243/1244 AG|
|Thai solar calendar||1474–1475|
1058 or 677 or −95
— to —
1059 or 678 or −94
- Summer – Alberic II leads an uprising at Rome against his stepfather Hugh of Provence, king of Italy, after he is insulted at the wedding of his mother, Marozia. Alberic seizes the Lateran Palace, and Hugh escapes with an escort out of the city. Marozia is captured and put in prison. Alberic takes control of the city and appoints himself as the ruler (princeps) of Rome.
- Doge Orso II Participazio retires voluntarily to a monastery, marking the end of the Participazio dominance of the Venetian dogeship. He is succeeded by Pietro II Candiano, the son and namesake of the earlier doge Pietro I.
- Pietro II and Capodistria make a trade agreement without imperial authorization, the self-proclaimed "Marquis" Wintkar forbids repaying any debts to Venice. Pietro begins an economic blockade of Istrian cities.
- Emir Mardavij ibn Ziyar invades Tabaristan and captures the city of Gorgan. The Daylamite military leader Makan ibn Kaki tries to reclaim his territories, but fails. He seeks refuge among the Samanids and enters the service of their ruler Nasr II. He appoints him as governor of Kirman (modern Iran).
- October 31 – Abbasid caliph al-Muqtadir is killed while fighting against the forces of general Mu'nis al-Muzaffar. Al-Muqtadir's brother al-Qahir is chosen to succeed him.
- Summer – Pope John XI is forced to grant power over Rome to his half-brother Alberic II, who is invested as "Prince and Senator of all Romans". John is to resign himself to spiritual leadership of the Catholic Church.
- May 6 – Qian Liu, Chinese warlord and king (b. 852)
- May 18 – Ma Shaohong, general of Later Tang
- June 1 – Thietmar, duke of Saxony
- June 10 – Dong Zhang, Chinese general
- August 15 – Ma Xisheng, king of Chu (b. 899)
- October 31 – Al-Muqtadir, Abbasid caliph (b. 895)
- The film Monty Python and the Holy Grail is set in this year.
- . Italian History - Timeline Lombard Leagues Board, p. 11.