The Baptistery of San Giovanni in Fonte in Lateran, Rome is an octagonal building erected in the fifth century. Rituals related to the baptism were held here. The centerpiece of the interior is the historic basalt baptismal font surrounded by eight Corinthian columns.
The baptismal font was intended for baptism by immersion, its size was adapted to the dimensions of an adult.
The interior of the building is very richly decorated, it carries Baroque style features, thanks to the seventeenth-century reconstruction managed by Andrea Sacchi. The scene of the battle at the Mulwijski Bridge, which took place in 312, was depicted on the ceiling.
The brick façades gained decorations in 1657. In that year the original frieze designed by Francesco Borromini was made. You can see here the coat of arms of Pope Alexander VII.