St Catherine was welcomed into the Dominican fold within this imposing church and its Cappella di Santa Caterina is adorned with frescoes by Il Sodoma depicting events in her life. Catherine died in Rome but her head was returned to Siena – it's clearly visible in a 15th-century tabernacle above the altar in a signed cappella near the gift shop.

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Tuscany in One Day Sightseeing Tour

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Also here are her desiccated thumb (in a small window box on the chapel's right) and a nasty-looking chain that the saint is said to have flagellated herself with.