It was built in 1791 by Cardinal Giovanni Francesco Albani on an octagonal plan symbolising resurrection (seven are the days of Creation, the eighth is the extra day, eternity), while the fountain is three-panelled and symbolises the Holy Trinity.
The Baptistery was restored in 1998. The octagonal floor plan is a symbol of resurrection; the baptismal font, carved by Francesco Saverio Moschetti of Monte Giorgio, has three wings and symbolises the Holy Trinity. The main mirror depicts the precursor St. John the Baptist in the act of baptising the Saviour. Inside the fountain is a copper water basin with the Albani coat of arms.
On the walls four lunettes narrate the story of original sin; the painted pelican is an allegorical symbol referring to the Eucharist. The deer, ostrich, lion and elephant, depicted on the walls, symbolise the four cardinal virtues.
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