Ghiyath al-Din
Meanwhile, in Delhi, Khusrau Khan murdered Mubarak Shah, and usurped the throne of Delhi in 1320. He was dethroned by a group of rival nobles, and Ghiyath al-Din Tughluq became the new Sultan. According to the 16th century chronicler Firishta, Prataparudra had stopped sending tributes to Delhi by this time. Therefore, Ghiyath al-Din sent his son Ulugh Khan (later Muhammad bin Tughluq) to Warangal in 1323. Prataparudra put up a strong resistance this time, but ultimately retreated to his capital Warangal. Ulugh Khan besieged Warangal, while another part of the Delhi army led by Abu-Riza besieged Kotagiri.