Young Despot Porphyrios, ascended to the throne not even half a week old when his father died from an incapacitating head injury. No father figure to raise him right, his Frankish mother embezzling royal funds... Thankfully, his tutor steered him down the right path, raising him in his father's absence to be a diligent, gregarious king-in-making. Unfortunately...
Come on, it was his first time
A meager twelve years of age and the young king has to be a father before he's even fit to rule the kingdom.
His noble tutor dies infirm, leaving the education of Porphyrios undetermined. He's 15 by now, diligent, zealous, honest, gregarious, and fantastic diplomatic tact. For his final year of study, he will focus instead on the stewardship of rulership. Who in the realm would be most qualified? The Baroness that hooked up with him in a drunken fling when he was just a boy. Typically, she taught him to let loose, indulge, and enjoy life, enforcing his gluttony.
No worries. A few ways to take care of that. The boy has become a man, and now it's time to carve out his own destiny! History will forever remember--!
...oh. Live fast, die young, leave a pock-marked corpse.