Responses
If he beheaded the king what would he do? He grew up sheltered and didn't know his father was this evil and I don't think he has the knowledge to govern a whole kingdom . And what if he beheaded the king of gallico first of all he couldn't because he's on a foreigner country and gallico is more stronger than his kingdom so if he succeeded killing the king of gallico he would be killed aswell and mind you gallico has gun powder weapons
Still killing his father would be beneficial for all. Ari would guide Alfonso.
Bruh... If i were Alfonso I would just draw my sword and beheaded the king long time ago and claim the throne... Even people would be grateful to save them before dumb af king. Beheading the cousin (this shitty king from his mother side) would be great too.