When? The Death of Caesar- Gaius Crowned Emperor

44 BC- Julius Caesar is killed by the Senate

44- 31 BC- The Triumvirate of Marc Antony, Lepidus, and Octavian rule

31 BC- Octavian beats Marc Antony and Cleopatra

27 BC- 14 AD- Octavian changes his name to Caesar Augustus and rules Rome

14 AD- Tiberius, Augustus' stepson, is the new ruler of Rome

37 AD- Gaius is crowned emperor

http://www.history-timelines.org.uk/places-timelines/03-ancient-rome-timeline.htm