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Ussillya-Tissa Thera

He was a resident of the Abhayagiri-vihāra. When the monks of this vihāra tried to introduce the Vaitulya heresy, he refused to be associated with them and went, with a few others, to Dakkhiṇāgiri-vihāra. There they formed the Sāgalikā sect under a monk named Sāgala. P.L.C.66.