The twin brother of Amrod and the youngest son of Fëanor. He was named Ambarussa ,"Russet", by his mother Nerdanel, in reference to his red hair. He was close to his twin brother and they did everything together.

When their older brothers Maedhros and Maglor came to the Mouths of Sirion looking for the Silmaril that Elwing posessed,they eagerly followed. They were both slain in the assault on the Mouths of Sirion in the last years of the First Age.

In the notes for a planned “excursus” on the names of the Sons of Fëanor (c.1968) Tolkien gave his Quenya name as Telufinwë ‘Last Finwë’ In these same notes his mother-name is given as Ambarussa. At this late stage of his life Tolkien toyed at length with the mother-names of Amras, and his twin brother Amrod, experimenting with an idea that one of them might have perished when the ships were burned at Losgar. (Source: HoME Vol.XII, The Shibboleth of Fëanor)
Encyclopedia entry originally written by Perathion