There are 3 books in the The deGranville Trilogy series. The newest book is Blaze of Silver which came out in 2007.

1
Blood Red Horse

Book cover of Blood Red Horse
Will longs to be a knight, like his older brother Gavin. Then he could ride a charger, fight bravely in the Crusades for King Richard, and win the heart of a fair maiden. All he needs is a horse. And when he chooses one, he chooses well - a small…
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2
Green Jasper

Book cover of Green Jasper
Spring 1193 Just returned from the Crusades, brothers Gavin and Will find home changed more than they'd expected - in fact home is a very dangerous place indeed. Ellie is reluctantly preparing for her wedding to Gavin. He's not the problem - marriage is. To Ellie, it means a) servitude,…

3
Blaze of Silver

Book cover of Blaze of Silver
Time is running out for William de Granville. King Richard is captive, his country in jeopardy and the future of both lie in Will's hands. But deceit lurks even in the most unexpected places. Can Will complete the dangerous journey to rescue the king? And will he ever find true…