In hoc signo vinces

Detail from The Vision of the Cross by assistants of Raphael, depicting the vision of the cross and the Greek writing "Ἐν τούτῳ νίκα" in the sky, before the Battle of the Milvian Bridge.
"In hoc signo vinces" on a 1721 Portuguese coin from the reign of King João V.

"In hoc signo vinces" (Classical Latin[ɪn hoːk ˈsɪŋnoː ˈwɪŋkeːs], Ecclesiastical Latin[in ok ˈsiɲo ˈvintʃes]) is a Latin phrase conventionally translated into English as "In this sign thou shalt conquer".

The Latin phrase itself renders, rather loosely, the Greek phrase "ἐν τούτῳ νίκα", transliterated as "en toútōi níka" (Ancient Greek[en túːtɔːi̯ níːkaː], Modern Greek[en ˈtuto ˈnika]), literally meaning "in this, conquer".[citation needed]


Lucius Caecilius Firmianus Lactantius was an early Christian author (c. 240 – c. 320) who became an advisor to the first Christian Roman emperor, Constantine I (and tutor to his son), guiding the Emperor's religious policy as it developed during his reign.[1] His work De Mortibus Persecutorum has an apologetic character, but has been treated as a work of history by Christian writers. Here Lactantius preserves the story of Constantine's vision of the Chi Rho before his conversion to Christianity.[2] The full text is found in only one manuscript, which bears the title, Lucii Caecilii liber ad Donatum Confessorem de Mortibus Persecutorum.

The historian bishop Eusebius of Caesaria states that Constantine was marching with his army (Eusebius does not specify the actual location of the event, but it is clearly not in the camp at Rome), when he looked up to the sun and saw a cross of light above it, and with it the Greek words "(ἐν) τούτῳ νίκα" ("In this, conquer"),[3] a phrase often rendered into Latin as in hoc signo vinces ("in this sign, you will conquer").[4]

At first, Constantine did not know the meaning of the apparition, but on the following night, he had a dream in which Christ explained to him that he should use the sign of the cross against his enemies. Eusebius then continues to describe the Labarum,[5] the military standard used by Constantine in his later wars against Licinius, showing the Chi-Rho sign. The accounts by Lactantius and Eusebius, though not entirely consistent, have been connected to the Battle of the Milvian Bridge (312 AD), having merged into a popular notion of Constantine seeing the Chi-Rho sign on the evening before the battle.[citation needed]

The phrase appears prominently placed as a motto on a ribbon unfurled with a passion cross to its left, beneath a window over the Scala Regia, adjacent to the equestrian statue of Emperor Constantine, in the Vatican. Emperors and other monarchs, having paid respects to the Pope, descended the Scala Regia, and would observe the light shining down through the window, with the motto, reminiscent of Constantine's vision, and be reminded to follow the Cross. They would thence turn right into the atrium of St. Peter's Basilica, ostensibly so inspired.[citation needed]

The Kingdom of Portugal has used this motto since 1143, according with the legend in Lusíadas.

Cultural referencesEdit




In hoc signo vinces is the motto of:



See alsoEdit


  1. ^ "Lucius Caecilius Firmianus Lactantius". Online Catholic Encyclopedia. New Advent.
  2. ^ Roberts, Alexander; Donaldson, James, eds. (1871). "The manner in which persecutors died. Chapter 44". The works of Lactantius. Volume II. Ante-Nicene Christian Library: Translations of the writings of the Fathers. Down to A.D. 325. XXII. Edinburgh. p. 203.
  3. ^ Eusebius. "1.28". Vita Constantini (PDF). p. 944.
  4. ^ Haaren, John H.; Poland, A. B. (2006) [1904]. Famous Men of Rome. Yesterday's Classics. p. 229. ISBN 978-159915-046-8.
  5. ^ Eusebius, Vita Constantini 1.31, p. 946.
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  27. ^ Grierson, Philip (1982). Byzantine Coins. University of California Press. p. 111. ISBN 0-520-04897-0.
  28. ^ "Story of Coat of Arms". 24 November 2010. Retrieved 4 January 2012.
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  30. ^ "Zdzisław Beksiński: x11". Retrieved 27 December 2016.
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  32. ^ Chris Harrald et al. The Cigarette Book: The History and Culture of Smoking