Explanation: The Roman Emperor Caligula, sometimes said to be mad, once threatened (or joked, depending on who you ask) to make his horse consul, one of the two leaders of the Senate. He didn’t carry through with the threat, but it was a memorable anecdote of his bizarre reign.
Imagine if he didn’t back down. The glories Rome could have seen…
That Time A Horse Became Empress Of Rome

Only in Crusader Kings II could a horse rise to power and, after decades of war and conquest, restore the might of the Roman Empire.