HORSTMANN, IGNATIUS FREDERICK (16 Dec. 1840-13 May 1908), third bishop of Cleveland, was born Philadelphia, Pa., to Frederick and Catherine Weber Horstmann. He was educated at the Jesuit College of St. Joseph and St. Charles Borromeo Seminary in Philadelphia, became one of the first students at North American College in Rome in 1860, and was ordained a priest in 1865 in Rome. Returning to Philadelphia, he taught philosophy, German, and Hebrew at St. Charles Borromeo Seminary. In 1877 he became pastor of St. Mary Church in Philadelphia, gaining a reputation as a careful administrator and excellent preacher. In 1885 Horstmann was named chancellor of the Archdiocese of Philadelphia. He was also assistant editor of the American Catholic Quarterly Review and a founding member of the American Catholic Historical Society.
Horstmann was installed as bishop of Cleveland in
Lackner, Joseph, HSM. "Bishop Ignatius F. Horstmann and the Americanization of the Roman Catholic Church in the United States" (Ph.D. diss., St. Louis University, 1977).