Gondor did not wish to relinquish its claim to the tower, but lacked the strength to garrison it. A solution presented itself to the Steward of Gondor, Beren, as the Wizard Saruman suddenly reappeared from the East, offering to guard Isengard. Beren gladly gave him the keys to Orthanc. At first he resided there as Warden of the Tower on behalf of Gondor. The valley became known as Nan Curunír, the Wizard's Vale. On Sauron's return to Mordor, Saruman asserted himself as Lord of Isengard.