Gaius Julius Caesar Augustus Germanicus (August 31, 12 – January 24, 41), more commonly known by his nickname Caligula, was the third Roman Emperor and a member of the Julio-Claudian dynasty, ruling from CE 37 to 41 .
During his brief reign, Caligula focused much of his attention on ambitious construction projects and territorial expansion. He worked to increase the authority of the princeps and struggled to maintain his position against several conspiracies to overthrow him. He was eventually assassinated in 41 by several of his own guards in a conspiracy involving the Roman Senate.
Though very popular with the Roman public throughout his reign, all surviving ancient sources write that Caligula was an insane tyrant. They focus upon anecdotes of Caligula's alleged cruelty, extravagance and sexual perversity. Surviving sources, though, are scarce and much of Caligula's reign is a mystery.