Elendil (350-751 SA) was the son of Tar-Amandil, the third King of Númenor. He ascended the throne in 590 as the fourth King, and he ruled as Tar-Elendil for 150 years, until he surrendered the sceptre to his son Tar-Meneldur in 740.
He had three children, two daughters, Silmarien and Isilmë and one son, Meneldur (UT 173). The eldest was Silmarien, who became the ancestress of the Lords of Andúnië. The youngest was Meneldur, the following King.
UT = Unfinished Tales.