The Pendragon Banner by Sylvian Hamilton
A dying woman's confession sends Sir Richard Straccan, Crusader turned Bone- pedlar, on a search for the Pendragon Banner, a priceless relic sewn by Guinevere for King Arthur that has been lost for seven hundred years ...But the pursuit is hampered by the renegade lord, William de Breos. Meanwhile, Janiva, the woman Straccan loves, is accused of sorcery, imprisoned and threatened with ordeal by fire and it seems unlikely that Straccan will arrive in time to save her ...