The son and Heir to Ar-Adunakhor, who became the twenty-first ruler, and eighteenth King, of Numenor. His father was the first King to take his name in the Adunaic tongue, and Ar-Zimrathon established his tradition by doing the same, though the Elvish form of his name, Tar-Hostamir, is also recorded.

Ar-Zimrathon held the Sceptre of Numenor for seventy-one years, and was succeeded by his son, who ruled as Ar-Sakalthor.

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