Eventually murdered by Cassius Chaerea, he had become unpopular due to mental instability and personal excesses, such as building a boat bridge across the Bay of Naples.
He transferred the last legion that had been under a senatorial proconsul to the command of an imperial legate.  He executed Naevius Sutorius Macro, the Praetorian prefect who made him emperor, and consecrated his own dead sister Drusilla as "Diva."  Eventually murdered by Cassius Chaerea, he had become unpopular due to mental instability and personal excesses, such as building a boat bridge across the Bay of Naples. Roman emperor from 37-41, FTP, name this son of Germanicus nicknamed "Little Boots."
He transferred the last legion that had been under a senatorial proconsul to the command of an imperial legate.  
Caligula or Gaius Caesar Germanicus