Second son of Saddhātissa and king of Ceylon (59 B.C.).
On his father's death the ministers crowned him king, but after a reign of only one month and a few days his elder brother Lañjatissa overpowered him and seized the throne.
Thūlathana built the Kandara-vihāra (Mhv.xxxiii.15ff) and a cetiya on the Sirīsamālaka (MT.355).