During the governorship of Izz al-Din Yahya in Satgaon, Shamsuddin Ilyas Shah took service under him. Following Yahya's death in 1338, Ilyas Shah took control of Satgaon and declared himself as a Sultan, independent of Delhi. He then waged a campaign, defeating both the Sultans Alauddin Ali Shah and Ikhtiyaruddin Ghazi Shah of Lakhnauti and Sonargaon respectively by 1342. This led to the foundation of Bengal as single political entity and the start of the Bengal Sultanate and its first dynasty, the Ilyas Shahi.