Aspects of this topic are discussed in the following places at Britannica.
...Asoka (3rd century bce), the Theravada school was established in Sri Lanka, where it subsequently divided into three subgroups, known after their respective monastic centres. The cosmopolitan Abhayagiriviharavasi maintained open relations with Mahayana and later Vajrayana monks and welcomed new ideas from India. The Mahaviharavasi—with whom the third group, the Jetavanaviharavasi,...
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