Tycen Lannister, fondly and not so fondly known as the Dark Lion, is the firstborn son of Lord Tywin Lannister and his second wife Lady Ashara Lannister - formerly Ashara Dayne. He has one full-blooded sister in Princess Alea Targaryen and is currently betrothed to Lady Sansa Stark.
With a seeming inability, or lack of desire, to make friends too some it is a wonder how he gained such favor in the eyes of the Westerlands Lords. Well, too all but those who know him too be his father remade. It is only a matter of time before he steps out from behind such a large shadow. He is played by Jaz on A Thousand Eyes and One.