Ignatius of Loyola, StIg‧nat‧i‧us of Loy‧o‧la, St /ɪɡˌneɪʃəs əv lɔɪˈəʊlə/ (also St Ignatius Loyola)(1491–1556) a Spanish priest who started the jesuitorder (=a Roman Catholic group of missionary priests, which is also called the society of jesus) →Francis Xavier, St