
Starting our perambulation at the corner near the campanile, where we left the Piazza, this (west) side is occupied entirely by the Libreria (Library) designed by Jacopo Sansovino to hold the Biblioteca Marciana (library of St Mark). Building started in 1537 and it was extended, after the death of Sansovino, by Vincenzo Scamozzi in 1588/91. The building was said by Palladio to be "the most magnificent and ornate structure built since ancient times". The arcade continues to the end of the building with cafés and shops and also the entrances to the Archaeological Museum, the Biblioteca Marciana and the National Library, which occupy the floors above. The Libreria designed by Sansovino and the two columns in the Piazzetta, seen from the lagoon


On the rear corner of the Doge's Palace is a sculpture of the Judgment of Solomon with the archangel Gabriel above. The sculptors are not known. Set back from this corner is the Porta della Carta, the ceremonial entrance to the palace, built in fine gothic style in 1438/43, probably by Giovanni and Bartolomeo Bon. Again, there is at the top a figure of Venice as Justice, the theme of fair judgment and justice being much emphasised on this side of the palace. Below this, the head of Doge Francisco Foscari and the lion before which he is kneeling were replaced in 1885, the originals having been destroyed on French orders in 1797. The statues on either side of the gateway represent the cardinal virtues of Temperance, Fortitude, Prudence and Charity.
Next to this, on an outside corner of the basilica of St Mark, are four antique figures carved in porphyry, a very hard red granite. They are usually known as the Tetrarchs and said to represent the four joint rulers of the Roman Empire appointed by Diocletian and were formerly thought to be Egyptian. It is now thought probable (or, at least very possible) that they represent the sons of the Emperor Constantine, praised for their loving co-operation on his death in 337, especially as the work originally stood in the Philadelphion (Place of Brotherly Love) in Constantinople, where the missing foot of one of the figures has been found.
Beyond this, in front of the South wall of the Basilica are two rectangular pillars always known as the Pillars of Acre. They were thought to be booty taken by the Venetians from Acre after their great victory over the Genoese there in 1258, but this traditional story has also had to be revised. The pillars actually came from the church of St Polyeuktos in Constantinople (524-7), and were probably taken by the Venetians soon after the fourth crusade in 1204. The ruins of this church were discovered in 1960 and it was excavated in the 1990s, when capitals were found, which matched the pillars.
Beyond these pillars,opposite the corner of the Basilica, is a great circular stone of red porphyry known as the Pietra del Bando (Proclamation Stone) from which official proclamations used to be read. It has been suggested that this may have formed part of a column on which the so-called Tetrarchs stood.
Across the water (the Bacino di San Marco) at the end of the Piazzetta can be seen the island of San Giorgio Maggiore and the brilliant white facade of Palladio's church there.




























