Illyrica, Council of

(Conciliums Illyricum), held in the year 375, according to Ceillier and Hefele, by order of the emperor alentinian. It was attended by a large number of bishops, who met to consider the doctrine of the consubstantiality of the three divine persons, as it had been set forth at Nicaea. They issued a synodal letter to the churches of Asia, etc., confirming the doctrine with great emphasis, and they further decreed that the homousiastical trinity doctrine should be everywhere taught, and all those who should reject it be punished by anathema. See Hefele, Conciliengesch. 1, 716 sq.; Landon, Man. of Councils, p. 266 sq. SEE ARIANISM.