How did William the Conqueror increase royal power?

William the Conqueror established a tradition of royal authority in England by retaining large amounts of land under his direct control, forcing all vassals to swear first allegiance to him, and keeping account of all property in England through a census.

pan-africanism or pan-africanism is a political, philosophical, cultural and social movement that promotes african twinning, the defense of the rights of african people and the unity of africa under a single sovereign state, for all africans, both africa as of the african diasporas.