Iranian identity came under threat after the fall of the Sassanid Iran and the conquest of Iran by the Arab Muslims.The term Shu'ubiyya refers to a response by Persian Muslims to the growing Arabization of Islam in the 9th and 10th centuries and discrimination against Iranian people by the occupiers. It was primarily concerned with preserving Persian culture and protecting Persian identity. Some of the famous Iranian Shu'ubi figures are Bashar ibn Burd, Ismail Nisa'i, Zeyad e Ajam, Hissam ibn Ada, Abulhassan Ali Mada'ini, Abu Hatam Sajestani, Ibrahim ibn Mamshad and Abu Abdullah Muhammad Marzbani.