Answer: caligula

AnswerCrossword Clue
CALIGULAThird Roman emperor, AD 37-41
CALIGULAClaudius I followed him
CALIGULACruel Roman emperor.
CALIGULARoman whose name means "Little boots."
CALIGULAMad emperor of Rome
CALIGULARoman emperor: A.D. 37
CALIGULAHe made his horse a senator
CALIGULA"I live!"
CALIGULACruel Roman emperor
CALIGULAClaudius succeeded him