A. J. (Augustine J.) O'Reilly

Augustine J. O'Reilly, often listed as A. J. O'Reilly, is known for religious and historical works centered on the early Church and Christian martyrdom. Confirmed titles associated with him include The Martyrs of the Coliseum, The Victims of the Mamertine, The Double Triumph, and Alvira, the Heroine of Vesuvius.

The surviving information readily available online is limited, so a full personal biography is hard to verify with confidence. Based on the works that can be confirmed, he appears to have written for readers interested in Catholic history, moral storytelling, and dramatic retellings of early Christian life.

Because reliable biographical sources are scarce, many personal details about his life remain unclear. What stands out most today is the lasting presence of his books in library catalogs, reprints, and archival collections, especially among readers drawn to historical religious literature.