Lucius Cassius Longinus
Lepidus married Caligula's sister Drusilla sometime in November or December of 37. Little is known about him prior to this. Drusilla had been married to Lucius Cassius Longinus since 33 but Caligula forced his brother-in-law to divorce Drusilla so that she could marry Lepidus. The marriage lasted until Drusilla's death in June 38. They had no children. Because of this marriage, Lepidus became a close friend to Caligula and his family. After the death of Gemellus in 37, Lepidus was publicly marked by Caligula as his heir. In late 38, when the governor of Egypt Aulus Avilius Flaccus was arrested, Lepidus successfully persuaded Caligula to exile Flaccus to Andros rather than Gyarus.