Julius Caesar's great-nephew was Augustus, the first emperor of the Roman Empire. He was born Gaius Octavius in 63 BC, the son of Caesar's niece Atai. Caesar had no sons of his own so he named Octavius as his heir.
Upon his adoption, he took his grand-uncle's name which historians abbreviate as Octavian. After Caesar's assassination, Octavian formed an alliance with Mark Antony to wage war against the conspirators. Octavian and Antony warred against each other several years later, culminating in Octavian's victory at the battle of Actium in 31 BC. In 27 BC, the Roman Senate bestowed upon him the title of Augustus.