A theory unheard of. But it is possible when the Saxons sacked Rome in 410 AD. they sent a Romano-Saxon to Britain as ambassador to mend quarrels and to build an alliance with the Celtic tribes, and may have saw the potential outcome and turned on the Saxons.
No. There are no records of a King Arthur in England, certainly not in Anglo-Saxon England.
No, King Arthur is not believed to have been an Anglo-Saxon. He is a legendary figure from Celtic mythology and is associated with the Britons, who were a Celtic people. The Anglo-Saxons arrived in Britain centuries after the time when King Arthur is said to have lived.
Harold Godwinson was the last anglo-saxon king.
That really depends on which myth you go with. There are stories of King Arthur dating back to before Jesus Christ. Between the two options given I would say Anglo Saxon.
King Arthur die in the Battle of the Saxon's
Alfred the Great was a ninth-century Anglo-Saxon king. He expanded the territory of the Kingdom of Wessex and is the only English king with the epithet "the Great".
Anglo-Saxon. He wrote the Anglo-Saxon Chronicle.
Anglo-Saxon literature started with the Anglo-Saxon Chronicles commissioned by King Alfred the Great
From Shakespeare "thane" is a king's companion in Anglo Saxon England.
Athelstan.
Alfred the Great!
Stephen of Blois, nephew of the previous king Henry I.