Aragorn is the first king of Gondor in the restored Third Age after Sauron’s defeat.
Aragorn is introduced in The Lord of the Rings as Strider, a Ranger of the North. He is the heir of Isildur and belongs to the royal line of Gondor and Arnor. His ancestry is initially hidden from many characters, but his identity becomes central to the political and historical resolution of the story.
After the War of the Ring, Aragorn is crowned King Elessar and reunites the realms of Gondor and Arnor. His reign restores the line of kings that had been absent from Gondor for centuries. He marries Arwen, daughter of Elrond, and rules during the Fourth Age.
Denethor is the ruling Steward of Gondor during the War of the Ring, while Boromir and Faramir are his sons. They are therefore easy names to confuse with Aragorn in questions about Gondor’s leadership. Aragorn’s royal title and restored kingship distinguish him from the Stewards and other Gondorian figures.