Jameson is actually the son of Mercia Lowell and Thomas McCoy. After Thomas was killed, apparently by Stafarin, about 1125, the pregnant Mercia had the wizard's council hide her pregnancy, and later, hide her child. He knows his true identity, but this knowledge cannot be read from his mind.
As the inheritor of half the McCoy fortune and one-third the Lowell fortune, he is very wealthy, probably worth 250 million gold or more.
Rook's home is a manor house with a large central tower, magically protected against teleportation and flight in a 100' radius.