It will doubtless be generally admitted that the ecclesiastical buildings of the earlier centuries of the Christian era merit careful study, as well from the investigator into the history and antiquities of the Christian Church, as from the architectural antiquary. The style and ornamentation of the church and the baptistery must necessarily reflect something of the tone of feeling towards religious matters which prevailed at the time of their erection, whilst the form of the structure, and even more those fittings and arrangements by which it was adapted to ritual purposes, must obviously have been planned and modified in accordance with the views of the age as regarded liturgical and ritual observances, ecclesiastical discipline, and even articles of faith. To the architectural antiquary, on the other hand, these buildings are interesting as enabling him to study the decline of Roman art, and as links in the great chain of architectural progress.