Why did Alfred the Great call himself “King of the Anglo-Saxons”? (and a little more)

by TheRealSlavicElmo

Why did Alfred the Great call himself “King of the Anglo-Saxons”? Why did Æthelstan call himself “King of the English” and why did William the Conqueror call himself “King of England”? Thank you!

BRIStoneman

Just to clarify, is your question why each of those kings chose those specific titles, or why the title changed between three men in ostensibly the same role?