Everything you need to understand or teach The Crystal Cave by Mary Stewart.
The Crystal Cave is a story of the life of Merlin before he became associated with King Arthur. The book begins with a Prologue, where Merlin describes being an old man reminiscing on the past. He says that some memories are clearer than others are.
He then describes a couple having a secret rendezvous at a cave. We do not know at the time that they happen to be his parents, the Lady Niniane and Prince Ambrosius.
Merlin tells us of his early life. He speaks of his childhood in South Wales in Maridunnum, when he is about six-years-old. He has learned to find safe places to hide, because he is loathed for his parentage. No one knows who his father is. His mother will not say. The King, his grandfather, hates him for being a bastard and treats him rough, while favoring his own bastard child, Dinias...
The Crystal Cave Lesson Plans contain 115 pages of teaching material, including: