Wikipedia:Sanga varman

Sanga varman (aka) Sanga varman lankeshwaran (995 CE - 1059 CE) was the fourth son of Rajendra Chola I. He went to war with his elder brothers Rajadhiraja I and Manukula Kesari to assist in the early days and fought as their best ally. He went to support his father during the invasion of srilanka in 1023 CE. In that battle Rajendra Chola conquered the whole of Sri Lanka and crowned his son Sanga varman as chieftain of srilanka with naming "Sanga varman lankeshwaran".