Historical Events in 45 BC Mar 17 In his last victory, Julius Caesar defeats the Pompeian forces of Titus Labienus and Pompey the Younger in the Battle of Munda Jan 1 The Julian calendar takes effect for the first time Famous People Who Died in 45 BC Apr 12 Gnaeus Pompeius, the Younger, Roman general Mar 17 Titus Labienus, Roman leader 46 BC History by Year 44 BC