Also known as Ludleth the Exiled, he sits on one of the five thrones at Firelink Shrine. He claims to have linked the fire long ago, becoming a Lord of Cinder, but he is now a charred cadaver.
If you attempt to kill him, he will fall. But if you travel away and return, he will be where he was, alive.
After returning all the Lords of Cinder to their thrones and speaking to the Fire Keeper, she will summon their power to become yours. This includes Ludleth, who will die in flames where he sits.