Medieval church of the twelfth century, was once known as St. Andrew’s out the door because the door was on the outside of the first city walls, now disappeared. The church is Romanesque in style, the facade returns traits typical of Pisa, with the lower part consists of blind arches and rose to the top. The interior has three naves divided by columns and arches. There would be buried Pier della Vigna, poet and secretary of Frederick II of Swabia. The church has been desecrated in the mid-nineteenth century and is now used for theatrical performances and activities.