There are seven Sons of Feanor: Maedhros, Maglor, Celegorm, Caranthir, Curufin, Amrod and Amras. The Sons of Feanor join their father in swearing an oath that no one but themselves will possess a Silmaril. The pursuit of this oath causes them much sorrow and hardship. Maedhros is the eldest son of Feanor and is referred to as the Tall. He forms the Union of Maedhros in the Nirnaeth Arnoediad and bears one of the Silmarils with him to his death in a pit of Ea at the end of the First Age. Maglor is Feanor's second son and is a great singer who casts his Silmaril into the Sea at the end of the First Age. The third son is Celegorm the Fair and is lord of Himlad with Curufin. He imprisons Luthien and dies in Menegroth by Dior's sword. The fourth son is Caranthir the Dark who is the quickest to anger. He rules in Thargelion and is killed in the assault on Doriath. Curufin the Crafty is the fifth son of Feanor and he rules Himlad with Celegorm. The sixth and seventh brothers are twins, Amrod and Amras. They are slain in the attack on Earendil's people at the Sirion.