One of the most fascinating figures in the Welsh mythology and the Arthurian legend is Merlin, the great wizard, prophet and adviser to several kings. 'Merlin and Arthur' by Willian O’Connor. You don't see many paintings of this part of the story.
Lady of the Lake This is the title of the ruler of Avalon in Arthurian legend. As well as providing Arthur with Excalibur, she is also recorded as having enchanted Merlin and raising Lancelot after the death of his father.