In hoc signo vinces (Classical Latin: [ɪn hoːk ˈsɪŋnoː ˈwɪŋkeːs]; Ecclesiastical Latin: [in ɔk ˈsiɲɲo ˈvintʃes]) is a Latin phrase meaning "In this sign you will conquer." It is a translation, or rendering, of the Greek phrase "ἐν τούτῳ νίκα" en toútōi níka (Ancient Greek: [en tóːtɔ͜ːi níkaː]), literally meaning "in this, conquer".
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, guiding his religious policy as it developed, and tutor to his son. 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. 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"), a phrase often rendered into Latin as in hoc signo vinces ("in this sign, you will conquer").
Hoc may refer to:
Hoc is also the Latin word for this, used in English especially in the phrase ad hoc.
Hnæf son of Hoc is a prince mentioned in the Old English poems Beowulf and the Finnsburg Fragment. According to the listing of tribes in the poem Widsith (10th century), Hnæf ruled the Hocings. Hoc is called Hoc Healfdene, suggesting a partly Danish ancestry.
According to the narrative, Hnæf was the brother of Hildeburh and brother-in-law of Finn, who ruled the Frisians and was killed during a Danish expedition to Frisian territory.
Hoc may be identical to the chieftain Haki mentioned in the Ynglinga Saga by Snorri Sturlason. This Haki conquered the kingdom of Uppsala and reigned there for ten years before he was cast out by king Jorund.
The father-son pair Hoc and Hnæf has been associated with the historical Alamannic noblemen, possibly of Nibelung extraction, Huoching (d. 744) and Hnabi (d. 788), the founder of the Ahalolfings. This suggestion was first made in 1849 by John Mitchell Kemble in History of the Saxons in England (p. 419). If the Old English legendary characters have been influenced by these historical characters, this would set the late 8th century as a terminus post quem for the date of Beowulf.