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The separate building in which the Sacrament of Baptism was once solemnly administered, or that portion of the church-edifice later set apart for the same purpose.
In ancient times the term was applied to a basin, pool or other place for bathing. The Latin term baptisterium was also applied to the vessel or tank which contained the water for baptism, and in the Early Church denoted indifferently the baptismal font and the building or chapel in which it was enshrined. There is no means of knowing when the first baptisteries were built; but both their name and form seem borrowed from pagan sources. They remind one of the bathing apartments in the thermae , and the fact that Pliny, in speaking of the latter, twice uses the word baptisteria seems to point to this derivation. The term was also applied to the bath in the circular chamber of the baths at Pompeii and to the tank in the triangular court of suburban villas. The earliest extant type of baptistery is found in the catacomb chambers in which were the baptismal-pools. (See BAPTISMAL FONT .) These rooms were sometimes spacious; that in the Roman catacomb of Priscilla adjoins other larger cubicula used perhaps for the adjuncts of the baptismal rite ; that of the Pontian cemetery bears traces of sixth-century mural decoration, a beautiful crux gemmata with other Christian symbols being yet visible. With the construction of edifices for Christian worship a special building was erected for the ceremonies of initiation. Ordinarily circular or polygonal, it contained in the centre the font; a circular ambulatory gave room for the ministers and witnesses who, with the neophytes, were numerous at the Easter and Pentecost solemnities ; radiating from the structure were rooms for the preparation of the candidates, and sometimes a chapel with altar for the Eucharistic service following baptism (cf. BAPTISM), as may be seen in the Lateran baptistery, The building sometimes joined, but was generally adjacent to, the cathedral or church to which it belonged, and was usually situated near the atrium or forecourt. Immersion gradually gave way to infusion, though in the South the custom of immersing children in the baptisteries persisted long after the North had commenced infusion in the small baptismal chapels. When separate baptisteries were no longer needed, the term was then applied to that part of the church which was set apart for an contained the baptismal font. The font was sometimes placed in a separate chapel or compartment, sometimes in an inclosure formed by a railing or open screen work; and often the font stands alone, either in the vestibule of the church, or in an arm of the transept, or at the western extremity of one of the aisles, and occasionally in the floor chamber of the western tower.
The modern baptistery is merely that part of the church set apart for baptism. According to the Roman Ritual, it should be railed off; it should have a gate fastened by a lock; and should be adorned, if possible, with a picture of the baptism of Christ by St. John. It is convenient that it should contain a chest with two compartments, one for the holy oils, the other for the salt, candle, etc. used in baptism. The form of the early baptisteries seems to have been derived from the Roman circular temples of tombs. And in adopting the plans, the early Christians modified them to some extent, for the internal columns which, in Roman examples were generally used in a decorative way, were now used to support the walls carrying the domes. To cover a large area with one roof was difficult; but by the addition of an aisle in one story, round a moderate-sized circular tomb, the inner walls could be replaced by columns in the lower half, which gave such buildings as these early baptisteries.
The earliest existing baptistery is that of the Lateran, said to have been erected in its original form under Constantine. Throughout the Roman world round or polygonal baptisteries seem to have been constantly employed from the fourth century onwards. In many places the Italians have preserved the separate building for baptism, while north of the Alps the practice generally prevailed of administering the rite in the churches. The construction of the baptistery of the Lateran is interesting because of a direct adaptation of the columnar system of the basilica to a concentric plan. The inner octagon is upheld by eight simple shafts, upon the straight entablature of which a second story of columns is superimposed. The original character of the ceiling and the roof cannot now be determined, but the weak supports were hardly adapted to bear a vault of masonry. Although baptisteries and mortuary chapels were generally built as simple cylindrical halls, without surrounding passages, other examples of the two modes of extension are not lacking.
The arrangement of the baptistery requires but brief notice. A flight of steps descended into the round or polygonal font ( piscina or fons ), which was sunk beneath the level of the floor, and sometimes raised a little above it by a row of columns which supported curtains to insure the most perfect privacy and decency during the immersion. The columns were united occasionally by archivolts, more frequently by architraves adorned by metrical inscriptions; the eight distichs in the Lateran baptistery are ascribed to Sixtus III .
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The baptistery of Pisa, designed by Dioti Salvi in 1153, is circular, 129 feet in diameter, with encircling aisle in two stories. Built of marble, it is surrounded externally on the lower story by half columns, connected by semicircular arches, above which is an open arcade in two heights, supported by small detached shafts. It was not completed till A. D. 1278, and has Gothic additions of the fourteenth century, in consequence of which it is not easy to ascertain what the original external design really was. The structure is crowned by an outer hemispherical dome, through which penetrates a conical dome 60 feet in diameter over the central space, and supported on four piers and eight columns. Thus, if there were another internal hemispherical cupola, it would resemble the constructive dome of St. Paul, London. This baptistery bears remarkable similarity to the church of San Donato (ninth century) at Zara, in Dalmatian, which, however, has a space only 30 feet in diameter. The baptistery at Asti, if examined with those of San Antonio, will give a very compete idea of Lombardic architecture in the beginning of the eleventh century. More or less interesting examples of baptisteries exist at Biella, Brindisi, Cremona, Galliano, near Milan, Gravedona, Monte Sant' Angelo, Padua, Parma, Pinara, Pistoia, Spalato, Verona, and Volterra. These are very few examples in Italy of circular or polygonal buildings of any class belonging to the Gothic age. Baptisteries had passed out of fashion. One such building, at Parma, commenced in 1196, deserves to be quoted, not certainly for its beauty, but as illustrating those false principles of design shown in buildings of this age in Italy. In later Romanesque and Gothic periods, in Italy, where the churches were not derived from a combination of a circular Eastern church with a Western rectangular nave, as in France, but were correct copies of the Roman basilica, the baptistery always stands alone. In Germany, the earlier baptistery was joined to the square church and formed a western apse. The only examples in England are at Cranbrook and Canterbury ; the latter, however, is supposed to have been originally part of the Treasury. It is not known at what time the baptistery became absorbed into the basilica. The change was made earlier in Rome than elsewhere. A late example of a separate baptistery, which, although small, is very beautiful in design, is in a court alongside the cathedral at Bergamo. This may be regarded as a connecting link between large buildings and fonts.
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