The Cambridge History of India, Vol. III: Turks and Afghans v3.c20.138

v3.c20.138

The defeat and humiliation of Qabācha had profited Iltutmish, who was at leisure, after Mangbarnī's flight, to turn his attention to Bengal, where Hisām-ud-dīn ‘Iwaz had assumed the title of Sultan Ghiyās-ud-dīn, and in 1225 he led his army through Bihār. On his approach ‘Iwaz submitted to him, abandoned the use of the royal title, acknowledged his sovereignty and presented to him, as tribute, thirty-eight elephants and much treasure, and Iltutmish, after appointing his eldest son, Nāsir-ud-dīn Mahmūd, governor of Oudh, and establishing his own governor in Bihār, returned to Delhi.