The Lineages and Histories of the Great Houses of the Seven Kingdoms

The Lineage and Histories of the Great Houses of the Seven Kingdoms is a book detailling the history of the Great Houses of Westeros, including the lineage and appearance of all heirs, with illustrations that show each house's sigil.

After his daughters note that Crown Prince Joffrey has blonde hair, Eddard Stark checks the Lineage and Histories, and discovers that all members of House Baratheon are described as "black of hair", except for the "golden headed" Joffrey.