TRINITARIAN (2)

Trin′i‐ta″ri‐an, n. 1. 1. One who believes in the doctrine of the Trinity.
2. 2. (Eccl. Hist.) One of a monastic order founded in Rome in 1198 by St. John of Matha, and an old French hermit, Felix of Valois, for the purpose of redeeming Christian captives from the Mohammedans.