Morgan is my Name by Sophie Keetch

My name is Morgan... And there aren’t enough words for all that I am.

When King Uther Pendragon murders her father and tricks her mother into marriage, Morgan refuses to be crushed. Trapped amid the machinations of men in a world of isolated castles and gossiping courts, she discovers secret powers. Vengeful and brilliant, it's not long before Morgan becomes a worthy adversary to Merlin, influential sorcerer to the king.

But fighting for her freedom, she risks losing everything – her reputation, her loved ones and her life.