The Knights of St. Stephen, to whom, indeed, the whole Piazza seems to be devoted, were a religious and military Order founded by Cosimo I, Grand Duke of Tuscany, who sits on horseback in front of the beautiful steps of the _Conventuale_. The object of the Order was to harry the Moorish pirates of the Mediterranean, to redeem their captives, and to convert these Moors to Christianity; nor were they wanting in war, for they fought at Lepanto. Cosimo placed the Order under the protection of St. Stephen, because he had gained his greatest victory on that saint's day. The Knights seem to have been of two kinds: the religious, who took three major vows and lived in the Conventuale under the rule of St. Benedict, and served the Church of S. Stefano; and the military, who might not only hold property but marry. Their cross is very like the cross of Pisa, but red, while that is white. In S. Stefano there is little to see, a few old banners, a series of bad frescoes, and a bust of S. Lussorius by Donatello, perhaps,--at least, that sculptor was working for eighteen months in the city. Before the sixteenth century this Piazza must have been very different from what it is to-day. Where S. Stefano stands now S. Sebastiano stood, that church where the Anziani met so often to decide peace or war.[78] Close by was the palace of the Podesta, while beyond the Palazzo Anziani rose the Torre delle Sette Vie, Torre Gualandi, Torre della Fame, for it bore all three names; only, the last came to it after the hideous crime of Ruggiero. If we cross the Piazza opposite the Palazzo Conventuale, and pass into Via S. Sisto, we come to the church of that saint, where also the Grand Council used to meet. It was founded to commemorate the great victories that came to Pisa on that day. Those antique columns are the spoil of war, as Tronci tells us.[79] Returning to the Piazza, and leaving it by Via S. Frediano, we soon come to the church of that saint, with its lovely and spacious nave and antique columns. A little farther on is the University, La Sapienza, founded by Conte Fazio della Gherardesca in 1338. In that year Conte Fazio enlarged the Piazza degli Anziani, so that _la nobilita_ should be able to walk there more readily; and to render the city more honourable, with the consent of the _Anziani_ and all the Senate, he founded a university, to lead the greatest doctors to lecture there; and to establish the Theatre of the Schools he sent ambassadors in the name of the Republic to Pope Benedict for his authorisation. Needless to say, this was given and in 1340 we find Messer Bartolo da Sassoferrato and Messer Guido da Prato, Doctor of Physics, lecturing on "Chirugia."[80] In 1589, Galileo was Professor of Mathematics here. The present building dates from 1493. Close by, between the University and the Lung' Arno, are the remains of an old gate of the city, Porta Aurea, and some remnants of towers.