From A Wiki of Ice and Fire
|| Warning |
This information has thus far been released in a sample chapter for The Winds of Winter, and might therefore not be in finalized form. Keep in mind that the content as described below is still subject to change.
|Book||The Winds of Winter (mentioned)|
Ser Addam Whitehead is a knight from House Whitehead and the son and heir of old Lord Whitehead.
The Winds of Winter
Arianne Martell's embassy to Jon Connington and the Golden Company lands at the Weeping Town, heading north to meet them at Griffin's Roost. While staying there, Ser Joss Hood overhears at the Loon inn that half a hundred men and boys from the Weeping Town already left to join Jon at Griffin's Roost, including Ser Addam, old Lord Whitehead's son and heir.
Behind the scenes
George R. R. Martin apparently named the character after longtime A Song of Ice and Fire blogger Adam Whitehead. Apart from being a moderator on the Westeros.org forums, Adam also runs his own award-winning Scifi and Fantasy review blog, The Wertzone.