Baptistery of San Giovanni alle Fonti
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Baptistery of San Giovanni alle Fonti

781
This paleo-Christian baptistery (489–512 AD), commissioned under Bishop Laurentius, contained an octagonal font once lined with marble and mosaic. Located beneath Milan Cathedral, it served Ambrosian rites — the distinct Milanese form of Christian worship derived from St Ambrose — until its burial and rediscovery in 1912. The structure marks a documented phase in Milan’s early Christian liturgy and architecture.