Nusrat al-Din Abu Bakr

Nusrat al-Din Abu Bakr (), was the ruler ("atabeg") of the Eldiguzids from 1191 to 1210. He used the titles of "Jahan-pahlavan" ("champion of the world"), "al-Malik al-Mu'azzam" ("the respected king"), and "Shahanshah al-A'zam" ("the great king of kings").