Ar-Zimrathôn was the twenty-first King of Númenor.
Like his father Ar-Adûnakhôr, Ar-Zimrathôn opposed the Valar, and he took his name in the Adûnaic tongue rather than in the traditional Quenya. But Númenórean scholars recorded his Quenya name Tar-Hostamir  so as to not offend the Valar. His name in both languages means "Jewel Gatherer", perhaps implying a greedy nature.
|Rulers of Númenor|
Elros Tar-Minyatur | Vardamir Nólimon | Tar-Amandil | Tar-Elendil | Tar-Meneldur | Tar-Aldarion | Tar-Ancalimë | Tar-Anárion | Tar-Súrion | Tar-Telperiën | Tar-Minastir | Tar-Ciryatan | Tar-Atanamir | Tar-Ancalimon | Tar-Telemmaitë | Tar-Vanimeldë | Tar-Anducal (Herucalmo) | Tar-Alcarin | Tar-Calmacil | Tar-Ardamin | Ar-Adûnakhôr | Ar-Zimrathôn | Ar-Sakalthôr | Ar-Gimilzôr | Tar-Palantir | Ar-Pharazôn