The hollow hills / Stewart, Mary

Merlin discovers the orphaned Arthur, whom he guides through manhood, and Arthur learns the secret powers of the mysterious sword leading him to claim the throne of Britain.

The second novel in the Arthurian Saga finds prophet and enchanter Merlin Ambrosius keeping watch over his orphaned charge, young Arthur Pendragon, until the fateful day when Arthur fulfills his destiny by pulling a fabled sword from a stone to claim the throne of Britain.