Which emperor was known for his eccentric and tyrannical behavior, including allegedly making his horse a consul? (r. 37-41 AD)

The story behind the answer

Caligula (r. 37–41 AD) is infamous for erratic, autocratic rule; ancient sources portray extravagance, cruelty, and bizarre stunts—most famously the claim that he planned to make his beloved horse, Incitatus, a consul. While likely exaggerated or satirical, the tale captures his reputation for mocking Rome’s institutions.

A Julio-Claudian and great-nephew/adopted grandson of Tiberius, Caligula—born Gaius—earned the nickname “Caligula” (“little boots”) from soldiers in his father Germanicus’s camps. His short reign ended with assassination by the Praetorian Guard. To remember: C for Caligula, C for Consul-horse and Capricious. Contrast with Nero (later fire and arts), Commodus (gladiator emperor), and Tiberius (reclusive predecessor).