Age of Magic - Deryni series (by Katherine Kurtz).
In the land of Gwynedd, In Gwynedd, men like Camber and Kelson have the Deryni gene which allows
them to perform magic. Gwynedd is a Christian society, based on Mediaeval
Britain with a strong celtic flavour. There are several other kingdoms
that vie with Gwynedd for supremacy. Within Gwynedd, through fear, the
Deryni are often persecuted and oppressed. Sadly some of these books are
out of print, so you may have to scour second hand bookstores for some of
them.
Camber
of Culdi,
Saint
Camber and
Camber
the Heretic deal with the origin of the Deryni and the exploits of
their champion priest Camber.
Deryni
Rising,
Deryni
Checkmate and High Deryni are set many years after Camber,
and deal with Kelson, the last heir to the throne of Gwynedd, who must use
his Deryni powers to survive. There is plenty of intrigue and battle in
these stories.
Bishop's
Heir, The King's Justice, The Quest for Saint Camber
and now
King
Kelson's Bride follow on and cover the further exploits of King
Kelson as he grows into a man and faces new enemies from abroad and
within.
Some of the most recent novels (the Heirs of Saint Camber series) are
set in between the times of Camber and Kelson:
The
Bastard Prince and
King
Javan's Year.