Tar Hostamir was the name which was written in the Scroll of Kings for the twenty-first of the Kings of Númenor who was better known as Ar-Zimrathon. He was the son of Tar-Herunúmen (Ar-Adûnakhôr).

Tar-Hostamir reigned for 71 years and was succeeded by his son Tar-Falassion (Ar-Sakalthôr) in SA 3033.
Encyclopedia entry originally written by Nienna-of-the-Valar