AnárionAnárion - The younger son of Elendil and founder of the Kingdom of Gondor.

 

"Isildur and Anárion were borne away southwards, and at the last they brought their ships up the Great River Anduin, that flows out of Rhovanion into the western sea in the Bay of Belfalas; and they established a realm in those lands that were after called Gondor..." ~The Silmarillion (Akallabêth)

 

Along with his father, he too was killed in the final battle of the Second Age.