Aragorn’s father in J.R.R. Tolkien’s The Lord of the Rings was Arathorn II.
Arathorn II was a Dúnedain chieftain and the husband of Gilraen. He belonged to the northern line of the heirs of Isildur, making his son Aragorn the next major heir of that lineage. Arathorn was killed when Aragorn was only two years old.
After Arathorn’s death, Aragorn was raised in Rivendell by Elrond, who kept the boy’s ancestry protected. Aragorn was known there as Estel, a name meaning “hope,” until Elrond later revealed his true heritage.
Arathorn II is easy to confuse with earlier rulers named Arathorn or with other famous ancestors such as Isildur and Elendil. The Roman numeral distinguishes Aragorn’s father from those related figures and identifies him as the second recorded bearer of the name.