Isilmë (early Second Age) was the second daughter of Tar-Elendil, fourth King of Númenor. Because of the law of agnatic primogeniture her younger brother would take up the Sceptre as Tar-Meneldur. Almost nothing is known of her life.
The word isilmë means "moonlight" in Quenya.
Tar-Elendil | __________|___________ | | | | | | Silmariën ISILMË Tar-Meneldur = Almarian | | Tar-Aldarion