Lords Of The White Castle by Elizabeth Chadwick
A violent quarrel with the future King John destroys the young Fulke FitzWarin's greatest ambition: to become Lord of the White Castle. Instead of accepting his fate, Fulke rebels. But the danger pursuing Fulke reaches new heights as he begins a passionate love affair with Maude Walter - the wealthy widow chosen by John himself.
Negotiating a maze of deceit, treachery and shifting alliances, Fulke's route to success is fraught. And when the turmoil of the Magna Carta rebellion combines with a shocking tragedy, everything Fulke has fought for is thrown into the path of destruction.