Thanks guys, I'm still learning the ropes, not only MR-wise, but for the game in general, I hadn't played it a lot before, and it was mostly back when the Viking expansion was released, so...
btw, my last eligible heir ended up surviving 15 years of constant plagues (do all plagues happen in Italy for some reason?), infirm condition, and being stung with needles in the eye in his sleep by his demon-possessed sister (literally)... to finally die at 16 due to an extra -3 health just when they found out he was actually "Incapable".
Game over. Lasted just 3 generations. Jeez, this game is pretty relentless. I've been G.O.-ed twice consecutively, within 70 years from the start since I've come back 2 days ago.
Suggest me a new start? I'm all ears.

I'd like to make it through the whole game once, with EUIV-export intents, but I wanted a "modest" start.