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Towards the end of the successor of Nagabhata II (of the Gurjara-Pratihara dynasty), he successfully attacked Kanauj and established control there. This was short-lived as he was soon after defeated by the Rastrakuta ruler, Govinda III. However, the Rastrakutas also formed a matrimonial relationship with the Gangas and defeated the kingdom of Vengi. By the end of the 9th Century, the power of the Rastrakutas started to decline along with the Palas. This was seen as an ideal opportunity by the feudal king Taila II who defeated the Rastrakuta ruler and declared his kingdom there. This came to be known the Later Chalukya dynasty. Their kingdom included the states of Karnataka, Konkan, and the northern Godavari. By the end of the tripartite struggle, the Pratiharas emerged victorious and established themselves as the rulers of central India.
Not much is known about the kingdom of the Kannauj after Emperor Harsha's death in 647 AD resulting in great confusion due to the absence of his heirs. Kannauj came for a short period under the hands of Arunasva who attacked Wang Hstian-tse who came to the court of king Harsha as ambassador of the Chinese emperor Tai-tsung. However, Wang Hstian-tse succeeded in capturing Arunasva who was taken back to China to spend his days in attendance on the Tang Emperor.
About AD 730, Yashovarman established a kingdom at Kannauj. His invasion of Gauda (Bengal) formed the subject of the Prakrit poem Gaudavaho (Slaying of the king of Gauda), composed by his courtier Vakapatiraja in the 8th century.
After Yashovarman, three kings — Vijrayudha, Indrayudha, and Chakrayudha — ruled over Kannauj between the close of the 8th century until the 820s. Talking advantage of the weakness of these Ayudha rulers and attracted by the immense strategic and economic potentialities of the kingdom of Kannauj, the Gurjara-Pratiharas of Bhinmal (Rajasthan), the Palas of Bengal and Bihar and the Rashtrakutas of the Manyakheta (Karnataka) fought against each other. This tripartite struggle for Kannauj lingered for almost two centuries and ultimately ended in favour of the Gurjara-Pratihara ruler Nagabhata II who made the city the capital of the Gurjara-Pratihara state, which ruled for nearly three centuries.