Dhatusena's ancestry is uncertain. The Cūḷavaṃsa, the ancient chronicle of Sri Lanka, tells us that he was of royal lineage whose ancestors had fled the royal capital about three hundred years earlier. The country was invaded in 433 by Tamils apparently of or related to the Pandyan dynasty from South India, known as "the Six Dravidians". They overthrew Mittasena and ruled the Anuradhapura Kingdom for twenty-six years, from 433 to 459. During this time, Sinhalese leaders abandoned Rajarata and fled to the Ruhuna principality in the south of the country. Ruhuna was used as the base for resistance against the invading rulers. Dhatusena was raised by his uncle, a Buddhist monk named Mahanama. The Pandyan invaders were searching for Dhatusena, and his uncle ordained him as a Buddhist monk to disguise him. Dhatusena later organised a resistance movement against the Tamil invaders and led a rebellion against them. Dhatusena claimed the kingship of the country in 455. By the time Dhatusena started the rebellion, three of the six Pandayn invaders were already dead, and in the battles that occurred during the rebellion, two more were killed. The final battle took place in 459, where the last king, Pithiya, was killed. Having successfully defeated the Pandyan invaders, Dhatusena was crowned as the king of Sri Lanka in 459, taking Anuradhapura as his capital.
Services as king
Dhatusena built eighteen irrigation tanks in order to develop agriculture in the country. Among these tanks are the Kala Wewa and Balaluwewa, which are interconnected and cover an area of. He also constructed the Yodha Ela, also known as Jayaganga, an irrigation canal carrying water from Kala Wewa to Tissawewa tank in Anuradhapura. Yoda Ela descends 95 millimeters at each kilometer. This is regarded as a great technological achievement. The Avukana Buddha statue, a high statue of Gautama Buddha, is also a creation of Dhatusena.
Death
Dhatusena had two sons, Kasyapa I and Moggallana I. Moggallana was the son of the royal consort and the rightful heir to the throne, while Kasyapa was born to a non-royal concubine. Dhatusena’s daughter was married to his sister’s son and the general of his army, Migara. Following an argument between his daughter and sister, Dhatusena ordered his sister to be killed. In reprisal, Migara encouraged and assisted Kasyapa to overthrow the king and take the throne. Kasyapa eventually rebelled against Dhatusena and overthrew him. Dhatusena was imprisoned and Kasyapa became the king of the country in 473. Migara led Kasyapa to believe that Dhatusena had hidden treasures of great wealth and persuaded him to find these. When asked to lead Kasyapa to where these treasures were hidden, Dhatusena led him to the Kalavewa and taking water into his hands, claimed that this was the only treasure he had. Enraged at this, Kasyapa had him murdered by entombing him in a wall..
