Arleg was a man of northern Eriador, a ranger and Spy in the service of the King of Arthedain.In about T.A. 1640 he had infiltrated the angmarian garrison of Barad Eldanar posing as a Northman Soldier from eastern Rhovanion named "Surk".
As a Tracker, he could leave the fortress with relative ease, so he was frequently able to communicate with the Rangers of Arthedain.
References
- MERP:Angmar - Realm