There are 6 books in the The Pendragon Cycle series. The newest book is Avalon which came out in 1999.

1
Taliesin

Book cover of Taliesin
A magnificent tale which begins with the tragedy of Atlantis and the arrival in Britain of King Avallach. In this world, Celtic chieftains struggle for survival in the twilight of Rome's power, and one heroic figure towers over all, the Prince Taliesin, in whom is the sum of human greatness.…
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2
Merlin

Book cover of Merlin
Book 2 of the Pendragon cycle A magnificent epic set against the backcloth of Roman Britain and Celtic legend. This is Merlin's story, the story of the Island of the Mighty - of warring battlechiefs and bloody Saecsen invaders, of the hidden Hill Folk, and the waning power of Rome.…

3
Arthur

Book cover of Arthur
"Evocate . . . intriguing . . . enthralling." -Locus

In a forgotten age of darkness, a magnificent king arose to light the land

They called him unfit to rule, a lowborn, callow boy, Uther's bastard. But his coming had been foretold in the songs of the bard Taliesin. And…

4
Pendragon

Book cover of Pendragon
Pendragon and Grail fill out Arthur's story, recounting the adventures which lead to Arthur's eventual crowning as Pendragon, and the gripping tale of Arthur's battle to retain control of the Holy Grail, the healing cup of Christ which comes to symbolise the peace and prosperity of his reign. Throughout, the…

5
Grail

Book cover of Grail
Book 5 of the Pendragon Cycle. A magnificent epic set against the backcloth of Roman Britain and Celtic legend. 'Only that which endures beyond time is worth having. Well I know it. I, who have given all for the mastery of time and the elements, know the value of life.…

6
Avalon

Book cover of Avalon

It has been foretold:
In the hour of Britain’s greatest need, King Arthur will return to rescue his people.

In Portugal, the reprobate King Edward the Ninth has died by his own hand.

In England, the British monarchy teeters on the edge of total destruction.

And in the Scottish Highlands,…