Arahael was a Dunadan and the second Chieftain of the Dunedain.
His father, Aranarth, gave him to Elrond to be fostered.
Arahael's reign was during the Watchful Peace, and his lands were not disturbed by war. Some decades before, the Witch-king ravaged through Arahael's grandfather, Arvedui's, lands. The Witch-king was in Minas Morgul at the time of Arahael's reign.
Arahael was succeeded by his son, Aranuir.