Lex Baratheon

Lex was one of the fourteen siblings he shared with William, Jon, Martyn, Orys, Theodor, Bryte, Tommax, Brune, Gude, Mace, Lorax, Wineiri, Miriam and Argella, all children of William Baratheon and Martyna Mullendore. The entire family is recorded not in the novels of the saga — where the character does not exist — but in The Lineages and Histories of the Great Houses of the Seven Kingdoms, the prop book seen in the series, within the section devoted to House Umber.

The material does not explain why Lex's lineage appears under the Umber heading rather than his own house. Nor does it record any deed, battle, or fate belonging to him: his existence is exhausted by that list of names.