Maelys Blackfyre was a descendant of Daemon Blackfyre (grandson, most likely) and known as "Maelys the Monstrous", as it was believed he devoured his twin in the womb, "explaining" the second, small vestigial head on his shoulders. He was the last of the Blackfyres. He became a merchant and claimed Westeros as his birthright. With the help of fellow merchants he attempted to take the Iron Throne but was slain by Ser Barristan Selmy.