For those who do not know, Emperor “Caligula” was not his real name. His actual name was Gaius Julius Caesar Augustus Germanicus. From History.com:

Think of it as the ancient equivalent of miniature Nikes and tuxedo-imprinted onesies: Even in Roman times, parents liked to proudly dress their progeny in tiny versions of grownup gear. And so, when the respected general Germanicus brought his son Gaius on campaign, the tyke sported soldier’s footwear, or caligae, scaled down to his size. (Some scholars think his wife Agrippina, granddaughter of the Emperor Augustus, chose the getup to emphasize her family’s imperial pedigree.) Either affectionately or mockingly, Germanicus’ troops called the boy “Caligula,” meaning “Little Boots” or “Booties.” The nickname stuck, but Gaius reportedly hated it.

[Source: @Butajape]