The Young Merlin Trilogy: Books 1 & 2 by Jane Yolen (Paperback)
Passager (The Young Merlin Trilogy, Book One)
A foundling rediscovers the secret of his true identity with the help of the falconer who had adopted him, in the first volume of a trilogy recalling the youth of the great wizard.
Hobby (Young Merlin Trilogy, Book Two)
Orphaned by a fire, young Merlin joins a pair of traveling magicians who help him begin to discover the nature of his true powers.