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Doctor of the Church is a title bestowed upon Irenaeus by Pope Francis. This honorific recognizes Irenaeus's significant contributions to Christian theology and doctrine. As a Doctor of the Church, Irenaeus is considered an authoritative figure whose writings hold great weight in Catholic tradition. His work played a pivotal role in shaping the early Church's understanding of key doctrines, including the Trinity, the Incarnation, and the Eucharist.