History: Assassinated for his mad antics, what Roman emperor made one of his horses a senator?

Caligula's real name was Gaius, and he is known to have terrorized his citizens in a number of unsavory ways. One example of his madness was when he made his favorite horse, Incitatus, a senator. The bejeweled steed was also to become his consul...but before the horse was dedicated, Caligula was assassinated.

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