1 linear inch.
Priest of the Diocese of Cleveland; author of 12 letters published by James McMaster in the New York Freeman's Journal and signed "Jus". The letters concerned the status of the clergy: O'Callaghan criticized the arbitrary use of power by bishops and called for the reform of canon law.
Transcripts of the "Jus" letters, 1868-1869; of correspondence between O'Callaghan and Richard Gilmour, Bishop of Cleveland, 1884; and of the letter in which O'Callaghan acknowledges that he wrote the "Jus" letters, 1896; copies of his citizenship papers, record of death, will, obituaries, and a photograph of his portrait; and parish history material from St. Colman's Parish, where he served as pastor.
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