Africa and Asia were able to gain strength after WWII were because after the war the colonial powers of Biritan and France, and the US spoke out about colonialism and some other European nations saw that they had to give up their colonial empires.
He shared it with French royals. When he became the King of England he didn't have to share it with anyone anymore and had his own kingdom that was separate from French nobles and French royalty. Since then, 1066, the Norman dynasties ruled the British Isles that they conquered.