Okay so looking over the evidence of his armour beating dragons, his attire and his level of skill with a weapon, i deduce that this person is undead and this undead person is?......wait for it.....
Eddard Stark!
http://library.creativecow.net/articles/kaufman_debra/Game-of-Thrones/assets/image-2-lg.jpg
Eddard Stark!
http://library.creativecow.net/articles/kaufman_debra/Game-of-Thrones/assets/image-2-lg.jpg