Some nice twists in here to keep the reader interested right from the first chapter, not the least of which Arthur was supposed to have been killed as an  infant, and his father willing to kill his own offspring for the sake of sating his lusts. Yet the monstrous actions of Uther don't hit you straight away, but that's probably because at first, you blame his wife the damned queen, but then you realise he's just as bloody bad, and like so many men, will do anything, even monstrous things, for the sake of his sausage.

Anyway, to me this seems original, and has some real potential. 

Bryn