There are 3 books in the The Chronicles of the Deryni series series. The newest book is High Deryni which came out in 1981.

1
Deryni Rising

Book cover of Deryni Rising
In the kingdom of Gwynedd, the mysterious forces of magic and the superior power of the Church combine to challenge the rule of young Kelson. Now the fate of the Deryni -- a quasi-mortal race of sorcerers -- and, indeed, the fate of all the Eleven Kingdoms, rests on Kelson's…
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2
Deryni Checkmate

Book cover of Deryni Checkmate
Threatened by King Kelson's trust in Duke Alaric Morgan, who boasts of his Deryni heritage, the priests of Gwynedd spread stories about Deryni atrocities and the race's inexplicable powers, in a revised and expanded edition of the second book in the Deryni series. Originally in paperback.

3
High Deryni

Book cover of High Deryni
The fantasy classic-revised and expanded.

New York Times bestselling Katherine Kurtz revisits the original trilogy of her career-launching Deryni Chronicles with this newly revised edition of High Deryni.

Kelson Haldane sits upon the throne of Gwynedd- the first king of Deryni heritage, possessing extraordinary magical abilities, to do so in…