Marcus Aemilius Lepidus, (6–39) was the son of consul Lucius Aemilius Paullus.[1] He and his sister Aemilia Lepida were both married to siblings of the Emperor Caligula (Aemilia married Caligula's elder brother Drusus Caesar; Lepidus married to Caligula's younger sister Julia Drusilla).[2] He was also great-grandson of Lucius Aemilius Lepidus Paullus (consul of 50 BC and brother of the triumvir Marcus Aemilius Lepidus). Some areas of his lineage are unclear. However, through his mother Julia the Younger, Lepidus was the great grandson of Emperor Augustus.[3] Lepidus married Caligula's sister Drusilla sometime in November or December of 37.[4] Little is known about him prior to this.[5] 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.[4] The marriage lasted until Drusilla's death in June 38.