What was Julius Caesar's deified name after his death?

Julius Caesar’s deified name after his death was Divus Julius, meaning “the Divine Julius” or “the Deified Julius.”

After Caesar was murdered in 44 BC, his adopted heir Octavian and his allies promoted his elevation among the Roman gods. The Senate formally recognized Caesar’s deification in 42 BC, during the conflict between the Caesarian faction and the assassins. From then on, Divus Julius became his official religious designation and an important foundation of the emerging imperial cult.

A spectacular comet appeared during the games held in Caesar’s honor in 44 BC. Romans interpreted it as evidence that Caesar’s soul had joined the heavens, and it became known as the sidus Iulium, or Julian Star. Octavian used this association to strengthen his own position, presenting himself as divi filius—the son of a god.

Divus Julius is not the same as Divus Augustus. Augustus was Octavian’s later title after he became Rome’s first emperor, while Divus Julius referred specifically to the deified Caesar. Mars Ultor and Jupiter Optimus Maximus were established divine figures, not Caesar’s posthumous name.