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Rajendra I (26 July 971 – 1044), often referred to as Rajendra the Great, was a Chola Emperor who reigned from 1014 to 1044. He was born in Thanjavur to Rajaraja I. His queen was Vanavan Mahadevi and he assumed royal power as co-regent with his father in 1012 until his father died in 1014, when Rajendra ascended to the Chola throne. During his reign, the Chola Empire reached its zenith in the Indian subcontinent; it extended its reach via trade and conquest across the Indian Ocean, making Rajendra one of only a few Indian monarchs who conquered territory beyond South Asia. In his early years, Rajendra was involved in the Chola Army, with which he fought in several campaigns against the Western Chalukyas and the rulers of Anuradhapura, earning him his first victories. He quelled rebellions in the Chera and Pandiya vassal states, and in Sri Lanka. As Emperor, Rajendra completed the conquest of Ruhuna and brought an entire portion of Sri Lanka under imperial rule. Rajendra expanded Chola rule by defeating the kingdoms of Kalinga and Vengai, and subduing the islands of Laccadives and the Maldives, which he renamed Munnir Palantivu Pannirayiram ("Twelve Thousand Islands and the Ocean Where Three Waters Meet").