Fossil said: "Caligula's "insanity" is not a historical fact, but an assumption by his enemies and choice historians.
also the T in James "T" Kirk came from his father Tiberius."

I was watching a show about him on T.V. and they were talking about they way they kept the wine back then in lead lined jugs.

They did some testing to find out how much lead would end up in the wine, and it was a lot, even more than they expected.

Caligula is rumored to have been a heavy drinker, and if that's true he ingested way too much lead, which would lead to insanity.

To the show I was watching it explained, at least to their satisfaction, how he could have gradually gone from reasonably sane to a complete nutjob.