What was the major reason for the decline of the first Pandyan empire?
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Opposition from Cholas and Pallavas
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Opposition from the Delhi Sultanate
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Opposition from the Mughals
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Opposition from the Guptas
After Vijayalaya Chola conquered Thanjavur by defeating the Muttarayar chieftains who were part of Pandya family tree around 850, the Pandyas went into a period of decline.
They were constantly harassing their Chola overlords by occupying their territories. Parantaka I invaded the Pandya territories and defeated Rajasimha III. However, the Pandyas did not wholly submit to the Cholas despite the loss of power, territory and prestige. They tried to forge various alliances with the Cheras and the Kings of Lanka and tried to engage the Cholas in war to free themselves from Chola supremacy. But right from the times of Parantaka I to the early 12th century up to the times of Kulottunga Chola I the Pandyas could not overpower the Cholas who right from 880-1215 remained the most powerful empire spread over South India, Deccan and the Eastern and Western Coast of India during this period.