O'REILLY, John, clergyman, born in Ireland in 1797; died in St. Louis, Maine, 4 March, 1862. He emigrated to the United States, entered Mount St. Mary's college, Emmettsburg, Maryland, and was ordained priest in 1827. He was appointed pastor of Huntingdon and the adjacent counties, built several churches, and was then transferred to Pittsburg. He afterward went to Rome and entered the Congregation of the Mission. On his return to the United States he was made superior of the house of the fathers of his order in St. Louis. He was then transferred to La Salle, where he built a church and founded a monastery, of which he was elected superior. He was next sent to the Seminary of St. Mary of the Angels, Niagara Falls, where he succeeded the present archbishop of Toronto as president. He was elected deputy to the general assembly of the priests of the Congregation of the Mission in Paris in 1861, and on his return retired to St. Louis.