The second child of King Tar-Súrion of Númenor, Isilmo had an elder sister, who succeeded their father to become Tar-Telperiën, the second Ruling Queen of Númenor.3 Tar-Telperiën would prove to be a proud Queen, too proud indeed to wed, and so she died without a direct heir. The line of royal descent then passed through Isilmo's line, and on to his son Minastir, who became King Tar-Minastir. The fact that the Sceptre of Númenor passed to Isilmo's son, rather than Isilmo himself, implies that he predeceased his sister, and therefore did not live to see his son become King. If this is correct, then Isilmo must have died at some point before the year II 1731.
During Isilmo's lifetime, momentous events had unfolded in Middle-earth. In Eregion, far away beyond the Sea, the Rings of Power were forged, and then the One Ring was made by Sauron. The War of the Elves and Sauron that followed began in II 1693, probably towards the end of Isilmo's lifetime. Whether Isilmo knew anything of these events, we are not told, but we do know that his son Tar-Minastir would play an important role in that War. Tar-Minastir sent a fleet to Middle-earth to aid the Elves, and succeeded in driving Sauron out of Eriador and back into Mordor.
Notes
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We have no specific dates for Isilmo, but as the younger child of Tar-Súrion, he must necessarily have been born after his elder sister Tar-Telperiën. We know that she was born in II 1320, so Isilmo would have probably have been born within a few years of that date. At least in earlier generations of his house, children tended to be born about eleven to thirteen years apart, so we might tentatively place Isilmo's birthdate at about II 1332. Tar-Telperiën went on to live for 411 years, so Isilmo's lifespan was presumably comparable. He certainly lived until the year II 1474, when his son Minastir was born.
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2 |
The Isil in Isilmo's name definitely refers to the Moon, but the -mo ending is a little more difficult to parse. This is usually an 'agental' or occupational ending, so a ciryamo was a 'mariner', and the Vala Ulmo had a name meaning 'he who pours' or 'the pourer'. It is difficult to see how such an agental ending could apply to the Moon (unless perhaps Isilmo dedicated himself to studying it). The -mo element could sometimes be used as a more generalised name-ending, effectively meaning just 'person', and in this sense Isilmo would mean something as simple as 'Moon person' or 'Moon man'.
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3 |
Until the time of Isilmo's ancestor Tar-Aldarion, the laws of inheritance in Númenor had followed the male line only, but Tar-Aldarion changed the law to allow his daughter Ancalimë to succeed him and become the first Ruling Queen. Tar-Aldarion's new law is recorded in various formulations, and by some of them a daughter would only succeed if no male heir existed. That cannot have been the case here, or Isilmo would have been Tar-Súrion's successor. Other versions of law simply state that the eldest child (whether a son or a daughter) should inherit, and that seems to have been the form of the law that saw Tar-Telperiën become Queen.
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- Updated 26 April 2026
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