San Pietro in Mercato, parish church in Montespertoli, Italy

San Pietro in Mercato is a parish church with Romanesque architecture located on the southern edge of Montespertoli, topped by a tall stone bell tower. The interior features three naves divided by pillars of varying sizes and contains a rare hexagonal baptismal font decorated with inlaid marble, dating from the 12th or 13th century.

First documented in 1008 among the churches paying tithes to the bishop of Florence, the pieve was consecrated in 1057. In the 15th century the Machiavelli family held patronage over the pieve and its parish. In the 16th century the pievano Baldassarre Machiavelli had it rebuilt, altering its Romanesque character; most Baroque additions were removed in a restoration campaign in the mid-19th century.

The church's name reflects the medieval market that once occupied the surrounding area and shaped local life. Its interior layout with three naves separated by sturdy pillars shows how it functioned for centuries as a gathering place for both spiritual and community activities.

The church is open to visitors by appointment only, so advance arrangements are necessary to see the interior. It is located on Via San Piero in Mercato in central Montespertoli and is easily accessible on foot, with the adjacent Museum of Sacred Art nearby offering additional context.

The hexagonal baptismal font with inlaid marble is a little-known rarity that preserves the craftsmanship of the 12th century in nearly perfect condition. It contrasts sharply with the early 20th-century facade featuring simulated white and green marble, illustrating how the church adapted across different periods.