The Hound and the Falcon Series by Judith Tarr

Alfred of St. Ruan's has lived his life in the seclusion of the monastery. But a badly wounded knight on a mission from the Elvenking, a beautiful and mysterious stranger who walks as both woman and beast, and a warrior king call him out of the cloister's walls into the wars and storms of the world. For he is neither mortal nor human, though he has long tried to live as both; and he can deny neither his nature nor his powerful magic... moreAlfred of St. Ruan's has lived his life in the seclusion of the monastery. But a badly wounded knight on a mission from the Elvenking, a beautiful and mysterious stranger who walks as both woman and beast, and a warrior king call him out of the cloister's walls into the wars and storms of the world. For he is neither mortal nor human, though he has long tried to live as both; and he can deny neither his nature nor his powerful magic.Winner of the Crawford Award, and Locus Award nominee for Best First Novel. less

Constantinople, A.D. 1203: a great army camps outside the City of Cities, and threatens it with conquest. Within the City, a Greek witch and a renegade monk who is also a white enchanter do their utmost to hold back the tides of war. But even their great powers may not be able to save Byzantium's empire from the Western Crusade.

Alfred has settled down at last amongst his own people, as Lord Chancellor of Rhiyana. But old enemies will not let Alfred savor his new life, and he must prepare for the ultimate battle of wills against an evil whose power is even greater than his own.

Alfred of St. Ruan's Abbey is a monk and a scholar, a religious man whose vocation is beyond question. But Alfred is also, without a doubt, one of the fair folk, for though he is more than seventy years old by the Abbey's records, he seems to be only a youth.But Alfred is drawn from the haven of his monastery into his dangerous currents of politics when an ambassador from the kingdom of Rhiyana to Richard Coeur de Leon is wounded and Alfred himself is sent to complete the mission... moreAlfred of St. Ruan's Abbey is a monk and a scholar, a religious man whose vocation is beyond question. But Alfred is also, without a doubt, one of the fair folk, for though he is more than seventy years old by the Abbey's records, he seems to be only a youth.But Alfred is drawn from the haven of his monastery into his dangerous currents of politics when an ambassador from the kingdom of Rhiyana to Richard Coeur de Leon is wounded and Alfred himself is sent to complete the mission. There he encounters the Hounds of God, who believe that the fair folk have no souls, and must be purged from the Church and from the world. less