Silmariën was the oldest child of King Tar-Elendil. Her other siblings were Isilmë and Meneldur. Women were not allowed to rule at the time of her father so when Tar-Elendil relinquished the Sceptre, she was passed over for the throne in favor of her younger brother, Tar-Meneldur. After her marriage with Elatan, they had a son named Valandil who became the first Lord of Andúnië.
From her and her husband's lineage came the Kings of Gondor and Arnor living in exile in Middle-earth. Nevertheless, she was one of the most significant of Númenor's royal family, as she presumably inherited both the sword Narsil and the Ring of Barahir from Tar-Elendil, her father.  These heirlooms were then handed down to her descendants, the Lords of Andúnië and later the Kings of Gondor and Arnor. The royal jewel, Elendilmir, included a fillet of Mithril that had once belonged to Silmariën survived the Fall of Númenor to become part of the crown of Arnor, and eventually survived up until the time of King Elessar.
The name Silmariën was a Quenyan word that was likely to have meant "silver maiden". It came from the words silma, meaning 'silver' or 'shining white', and rien, meaning 'maiden' or 'daughter'. Although unlikely, Silmariën may have meant "maiden crowned with silver" as the Sindarin word ríen, meaning 'crowned lady' or 'queen', suggests. Although fitting for her noble heritage, It does mean that it would be made from both Quenyan and Sindarin words, and so is unlikely.
- ↑ Unfinished Tales: The Line of Elros: Kings of Númenor
- ↑ Unfinished Tales: Aldarion and Erendis: The Mariner's Wife
- ↑ Unfinished Tales: A Description of the Island of Númenor, Note 2
- ↑ Unfinished Tales: The Disaster of the Gladden Fields