- "I fear it would be of little interest to you, my lord, a ponderous tome..."
- ―Grand Maester Pycelle to Eddard Stark
The Lineages and Histories of the Great Houses of the Seven Kingdoms is a book detailing the history of the Great Houses of the Seven Kingdoms, including the lineage and appearance of all heirs, with illustrations of each house's individual sigil.
After his daughters note that Joffrey Baratheon has blond hair, Lord 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, leading Ned to realize that Joffrey is not Robert's child, and thus not the real heir.
In the books
In the A Song of Ice and Fire novels, The Lineages and Histories of the Great Houses of the Seven Kingdoms, With Descriptions of Many High Lords and Noble Ladies and Their Children is an old book written by Maester Malleon. It doesn't mention the current Baratheons or Lannisters, but it mentions that throughout written history all Baratheons have been black-haired and that, likewise, every recorded union between Baratheon and Lannister has produced black-haired children.