He was a pretty terrible parent, but probably the greatest knight in history. Total badass in the melee, and a devoted husband. The dude was still killing enemy knights in battles he was in command of into his 70s.
You'd love this guy. Not one cheating scandal in his entire life. Not even credible rumors. People tried to claim he slept with the King's wife, but they were baseless rumors and it turned out William was hundreds of miles away during the time of the alleged cuckolding.
He had one wife his entire life, and they ended their marriage by dying, which is the nominal goal of marriage. He started off as a landless squire, got trained in the field, knighted mid combat, and killed three (ish) knights in his first battle. That ironically left him pretty broke, because the money was in ransom, and you can't ransom a dead guy.
So he starts fighting in tournaments, and he just cleans house. He became the most successful tournament knight at the time, a walking celebrity.