of Gondor > Isildur
Anárion was a Dúnadan and the
younger son of Elendil
Tall. With his brother, Isildur,
he was the second King
Gondor. When he left Númenor with his father, Elendil,
brother, Isildur, he owned two of the nine ships of the Faithful.
When they came to the shore of Lindon, Elendil founded the realm of
Arnor, and Isildur and Anarion bore south to what is now Gondor.
Two strong places they built, one in the west and one in the
east. Anárion's home was Minas Anor, Tower of the Setting
and Isildur's home was Minas Ithil, Tower of the Rising Moon.
Also, the Palantíri were divided. Anárion and Isildur took two each and placed them in Orthanc, Minas Anor, Minas Ithil, and Osgiliath.
Soon, Sauron prepared for war. First he took Minas Ithil, and destroyed the white tree of Isildur. But Isildur escaped down the Anduin, seeking Elendil. Meanwhile, Anárion defended Osgiliath.
Gil-galad and Elendil took counsel, and the Last Alliance was formed. Anárion joined the march to Mordor, but was slain by a rock thrown from Barad-dûr. His helm was crushed and so the helm of Isildur was used as the Crown of Gondor from then on.
References: The Silmarillion, The Return of the King
Kings of Gondor