Question

What is led to the decline of the Gurjara-Pratiharas?
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Answer 1

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Under Nagabhata II, the Gurjara-Pratiharas became the most powerful dynasty in northern India. ... The power of the Pratiharas was weakened by dynastic strife. It was further diminished as a result of a great raid led by the Rashtrakuta ruler Indra III who, in about 916, sacked Kannauj.

Answer 2

The Pratihara dynasty was an imperial power during the Late Classical period on the Indian subcontinent, that ruled much of Northern India from the mid-8th to the 11th century. They ruled first at Ujjain and later at Kannauj. The Pratiharas were instrumental in containing Arab armies moving east of the Indus River.[2] 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 Empire 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.[3][4] 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 India).

Pratihara are known for their sculptures, carved panels and open pavilion style temples. The greatest development of their style of temple building was at Khajuraho, now a UNESCO World Heritage Site.[5]

The power of the Pratiharas was weakened by dynastic strife. It was further diminished as a result of a great raid led by the Rashtrakuta ruler Indra III who, in about 916, sacked Kannauj. Under a succession of rather obscure rulers, the Pratiharas never regained their former influence. Their feudatories became more and more powerful, one by one throwing off their allegiance until, by the end of the 10th century, the Pratiharas controlled little more than the Gangetic Doab. Their last important king, Rajyapala, was driven from Kannauj by Mahmud of Ghazni in 1018.