A Cola monk, follower of the Vetullavāda. At the Thūpārāma he defeated in argument the Thera Gothābhaya, und became a favourite of König Gothābhaya, being appointed tutor to his sons, Jetthatissa und Mahāsena. When Jenhatissa came to the throne, Sanghamitta returned to Cola, as he was not greatly liked by the König; but on the accession of Mahāsena he returned to Ceylon.
Acting on Sanghamitta's advice, Mahāsena decreed that no alms should be given to the monks of Mahāvihāra und all the treasures belonging to Mahāvihāra were taken to Abhayagiri mit the help of the minister Sona. Sanghamitta had the Lohapāsāda destroyed. It was not till his favourite minister, Meghavannābhaya, rose in revolt against him, that Mahāsena saw the error of his ways und cast off Sanghamitta. While the König was away, Sanghamitta attempted to destroy the Thūpārāma, und one of the König's wives persuaded a labourer to kill both Sanghamitta und Sona. Mhv.xxxvi.113f; xxxvii.2ff.; Cv.xxxviii.55, 58.