A Catholic apologetics & formation system.

Person Type: Doctor of the Church

Athanasius of Alexandria
The great defender of Nicaea, exiled five times for refusing to compromise the doctrine that Christ is truly God of the same…
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Cyril of Jerusalem
Bishop of Jerusalem whose Mystagogical Catecheses — instructions to the newly baptised delivered within yards of where Christ was crucified — are…
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Ambrose of Milan
Governor, bishop, and theologian, Ambrose shaped the Western Church's sacramental theology and its relationship to imperial power. He refused Emperor Theodosius communion…
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John Chrysostom
The greatest preacher in the history of the Church, John Chrysostom combined extraordinary rhetorical gifts with uncompromising moral courage. His sermons on…
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Jerome
The most learned man of the late fourth century, Jerome combined mastery of Hebrew, Greek, and Latin with fierce polemical instincts. His…
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Augustine of Hippo
Bishop, theologian, and autobiographer, Augustine of Hippo is the most influential figure in Western Christian history after Paul and the four Evangelists.…
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Leo the Great
The greatest pope of the first millennium, Leo defined the Christology of the Council of Chalcedon, faced Attila the Hun at the…
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