Piazza Santa Trinita. The Piazza Santa Trinita is a triangular square in Florence, Tuscany, Italy, named after the church of Santa Trinita on the west side of the square. The piazza is traversed by the Via de' Tornabuoni. Near the middle of the square is an ancient Roman column known as the Column of Justice due to the sculpture of Justice on the top. Several Gothic and Renaissance palaces surround the square, these include: Palazzo Bartolini Salimbeni. Palazzo Buondelmonti. Palazzo Minerbetti. Palazzo Spini-Ferroni, presently the home of the Museo Salvatore Ferragamo and headquarters of the fashion house of that name.