The Church of Sant’Andrea in Castiglioncello del Trinoro, a hamlet of Sarteano, is a small Romanesque-style building, characterised by a simple travertine façade, a gabled roof and a bell tower with single-lancet windows, which emphasise its austere and ancient appearance.

The single-nave interior was renovated in 1789 by the architect Leonardo de Vegni, whilst retaining an intimate and evocative atmosphere. Among the most significant features is the chapel dedicated to the Blessed Bonaventura da Venere di Chieti, a Franciscan friar who lived between the 16th and 17th centuries and led a hermit’s life in the surrounding area. The chapel preserves frescoes and stuccoes on the vault, which are unfortunately now partly deteriorated but still bear witness to the devotion of the place.

Of particular interest is also the 14th-century travertine baptismal font, one of the oldest features in the church.

The church is set within the picturesque setting of the village of Castiglioncello del Trinoro, which once belonged to the Counts of Sarteano and is linked to the history of the Via Francigena. According to tradition, the village was known as Castrum Trinum Latronum, the ‘castle of the three thieves’, in reference to the bandits who attacked pilgrims and travellers along this important medieval route.