 The two led an army to take Shiraz, only to learn that Pir Hosayn had lost the city to another Injuid, Abu Ishaq.This did not stop Yagi Basti and Mas'ud Shah from entering Shiraz; once the two had gained control, Yagi Basti murdered Mas'ud and seized power for himself.Without his Injuid ally, however, Yagi Basti had little support within the city, and in March 1343 he was forced out by supporters of Abu Ishaq.