Emmel earned his Ph.D. from Yale University in 1993 (department of religious studies, program in the study of ancient Christianity).

Theologically, it not only deals with her life, but her veneration in daily life, prayer, art,music, architecture, in modern and ancient Christianity throughout the ages.

He also published scholarly works on the sacrament of confirmation, on exorcism, on baptism, and on the Eucharist in ancient Christianity.

Jerome is the second most voluminous writer (after St. Augustine) in ancient Latin Christianity.

Lamps have been found in all centers of ancient Christianity.

Widespread in ancient Christianity, it was the symbol used by the Roman emperor Constantine I as vexillum (named Labarum).

Vigils, night prayers in ancient Christianity.

In ancient and medieval Christianity, Caesaropapism is the doctrine where a head of state is at the same time the head of the church.

The true end of ancient Jewish Christianity occurred only in the 5th century.

Vigils is a term for night prayer in ancient Christianity.