text:  Hitherto the princes of his line had contented themselves with the style of _Amirs of the Moslems _ and _Beni-Kholaifah_ or "sons of the Khalifs;" but in 929 "seeing the state of weakness and degradation to which the khalifate of the Beni-Abbas at Bagdad had been reduced " he no longer hesitated to adopt the titles of Imam and Khalif with the appellation of An-nasir Ledinillah (defender of the religion of God ) under which he is generally mentioned by historians