The Pratihara dynasty, also called the Gurjara-Pratiharas, the Pratiharas of Kannauj or the Imperial Pratiharas, was a prominent medieval Indian dynasty which initially ruled the Gurjaradesa until its victory in the Tripartite Struggle in 816 which secured its right to the throne of Kannauj. Cadet branches of the dynasty ruled other minor states in the subcontinent.
The Pratiharas were instrumental in containing Arab armies moving east of the Indus River. Nagabhata I defeated the Arab army under Junaid and Tamin in the Caliphate campaigns in India. Under Nagabhata II, the Pratiharas became the most powerful dynasty in northern India. He was succeeded by his son Ramabhadra, who ruled briefly before being succeeded by his son, Mihira Bhoja. Under Bhoja and his successor Mahendrapala I, the Pratihara dynasty reached its peak of prosperity and power. By the time of Mahendrapala, the extent of its territory rivalled that of the Gupta Empire stretching from the border of Sindh in the west to Bengal in the east and from the Himalayas in the north to areas past the Narmada in the south. The expansion triggered a tripartite power struggle with the Rashtrakuta and Pala empires for control of the Indian subcontinent. During this period, Imperial Pratihara took the title of Maharajadhiraja of Āryāvarta (Great King of Kings of Aryan Lands).