Aragorn is a loyal companion of Frodo as a member of the
Fellowship of the Ring. He later follows the hobbits Merry and
Pippin to save them, but then joins the fight of the Rohirrim
agains Saruman. He later passes the Paths of the Dead through the
White Mountains to come to the aid of the Men of Gondor fighting at
Pelargir. There he mangages to capture the fleet of Umbar with the
help of the Dead of Dunharrow, who he then releases. He then sails
up the Anduin with the captured fleet and the Men from southern
Gondor, and and arrives to turn around the tide of the Battle of
the Pelennor Fields. After the battle, he and the Sons of Elrond do
much to heal the wounded. Afterwards he is one of the leaders of
the armies to fight in the Battle of the Black Gate. After the War,
he is made King of Gondor, restores his own Kingdom of Arnor, and
thus becomes King of the Reunited Kingdom of Gondor and Arnor.