Question

Did Caligula make his horse a consul?

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Answer

Almost certainly not. The story derives from two hostile sources written long after his death, and even the earlier of them says only that he intended to — reported as a rumour.

What the sources say. Suetonius, writing roughly 80 years later, records that Caligula lavished attention on his horse Incitatus — a marble stall, an ivory manger, a household of servants — and adds that it was said he intended to make the horse consul. Suetonius does not claim it happened.

Cassius Dio, writing later still, repeats the story and adds that Caligula would have done so had he lived longer.

Why the sources are problematic. Both wrote after Caligula's assassination, under successor regimes with strong reasons to portray him as a monster. Suetonius in particular collected sensational material and was writing biography as entertainment as much as history. Neither was a witness, and no contemporary account survives.

The more plausible readings:

A deliberate insult to the Senate. The likeliest interpretation among historians. Threatening to appoint a horse says that the office has become meaningless and senators are interchangeable with animals — a pointed humiliation of a body he was in open conflict with. Read this way, it is political theatre, not madness.

A joke taken literally by later writers.

Hostile invention entirely.

The wider problem with Caligula. Almost everything popularly known about him — the incest, the declaration of war on the sea, the demand for worship — comes from the same small set of hostile posthumous sources. Modern historians treat the record with considerable caution, and some argue he was an autocratic and erratic young ruler who alienated the elite, then had his reputation comprehensively destroyed by that elite's chroniclers.

He was assassinated in AD 41, aged 28, after less than four years in power.

Incitatus was real, and Caligula's indulgence of him is plausible.

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