Love your bit about Boris and the Rubicon – a perfect Brexit analogy. 10 points to your Team.
The Emperor Sextus Varius Avitus Bassianus (posthumously Elagabalus) – a hormonal 14 year old bisexual who became Emperor thanks to the machinations of his grandmother, after the assassination of his cousin.
Illegitimate son of the Emperor Caracalla, he was High Priest of the god Elagabal, the Syrian Sun God. He married 4 times, had male lovers and (allegedly) pimped himself out. Ruled during a complicated civil war. Finally assassinated at the age of 18 by his own Praetorian Guard – in a plot devised by the same grandmother that made him Emperor!