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In page History of Sri Lanka:

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Ellalan (205–161 BCE) was a Tamil King who ruled "Pihiti Rata" (Sri Lanka north of the Mahaweli) after killing King Asela. During Ellalan's time Kelani Tissa was a sub-king of Maya Rata (in the south-west) and Kavan Tissa was a regional sub-king of Ruhuna (in the south-east). Kavan Tissa built Tissa Maha Vihara, Dighavapi Tank and many shrines in Seruvila. Dutugemunu (161–137 BCE), the eldest son of King Kavan Tissa, at 25 years of age defeated the South Indian Tamil invader Elara (over 64 years of age) in single combat, described in the Mahavamsa. The Ruwanwelisaya, built by Dutugemunu, is a dagaba of pyramid-like proportions and was considered an engineering marvel.[citation needed]