which dynasty stopped the expansion of the pratiharas into the deccan
Gurjara-Pratihara dynasty The metropolis of Kannauj had suffered a power vacuum following the death of Harsha without an heir, which resulted in the disintegration of the Empire of Harsha. This space was eventually filled by Yashovarman around a century later but his position was dependent upon an alliance with Lalitaditya Muktapida. When Muktapida undermined Yashovarman, a tri-partite struggle for control of the city developed, involving the Pratiharas, whose territory was at that time to the west and north, the Palas of Bengal in the east and the Rashtrakutas, whose base lay at the south in the Deccan.[32][33] Vatsraja successfully challenged and defeated the Pala ruler Dharmapala and Dantidurga, the Rashtrakuta king, for control of Kannauj.