(AD 12-AD 41, reigned AD 37-AD 41) was the son of Germanicus, Tiberius's popular nephew, and earned the nickname "Caligula," or little boot, from his father's soldiers. Though initially moderate, Caligula became increasingly tyrannical, supposedly trying to build a palace on Lake Nemi and to make his horse, Incitatus, a consul. In AD 41, Cassius Chaerea led a conspiracy of senators and Praetorian guards that killed Caligula and his immediate family.