Adhar Valash was an Iranian prince from the House of Karen, who ruled Tabaristan and Gurgan under the authority of the last Sasanian emperor Yazdegerd III (r. 632–651).
A descendant of the prominent 6th-century statesman Bozorgmehr, Adhar Valash had been given control over the provinces during the Arab conquest of Iran.
[1] Not long after, his domain was threatened by the Gil Gavbara, a great-grandson of the 5th-century Sasanian ruler Jamasp (r. 496–498).
[2] Adhar Valash requested the aid of Yazdegerd III, who, however, after being informed of Gil Gavbara's Sasanian descent, ordered Adhar Valash to submit to the latter.
[1] Some time afterwards, Adhar Valash died during a game of polo after falling from his horse.