The 'Chola dynasty'  was one of the longest-ruling dynasties in the history of southern India. The earliest datable references to this Tamil dynasty are in inscriptions from the 3rd century BCE left by Ashoka, of the Maurya Empire. As one of the Three Crowned Kings, the dynasty continued to govern over varying territory until the 13th century CE.
The heartland of the Cholas was the fertile valley of the Kaveri River, but they ruled a significantly larger area at the height of their power from the later half of the 9th century till the beginning of the 13th century. The whole country south of the Tungabhadra river was united and held as one state for a period of two centuries and more. Under Emperor Rajaraja Chola I and his successors Rajendra Chola I, Rajadhiraja Chola, Virarajendra Chola and Kulothunga Chola I the dynasty became a military, economic and cultural power in South Asia and South-East Asia.The power of the new empire was proclaimed to the eastern world by the expedition to the Ganges which Rajendra Chola I undertook and by the occupation of cities of the maritime empire of Srivijaya in Southeast Asia, as well as by the repeated embassies to China
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The CholasThe founder of the Chola Empire was Vijayalaya, who was first feudatory of the Pallavas of Kanchi. He captured Tanjore in 850 A.D. He established a temple of goddess Nishumbhasudini (Durga) there. Aditya I succeeded Vijayalaya. Aditya helped his overlord the Pallava king Aparajita against the Pandyas but soon defeated him and annexed the whole of the Pallava kingdom.

By the end of the ninth century, the Cholas had defeated the Pallavas completely and weakened the Pandyas capturing the Tamil country (Tondamandala) and including it under their domination He then became a sovereign ruler.
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