Who usurped the throne from King Arthur

Mordred

Explanation:

The 14th-century Scottish chronicler John of Fordun claimed that Mordred was the rightful heir to the throne of Britain, as Arthur was an illegitimate child (in his account, Mordred was the legitimate son of Lot and Anna, who here is Uther's sister).

i would say the answer is erm c but if you dont agree im so sorry

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