Following Via Cavour, past Palazzo Panciatichi-Cellesi, through Via Francesco Magni, into Piazza del Duomo, you are in the midst of all that was most splendid in Pistoja of old: the Duomo, with its old fortified tower, Torre del Potesta, which still carries the arms of those captains; the Baptistery, high above the way, designed by Andrea Pisano, with its open-air pulpit and broken sculptures; the magnificent Palazzo del Comune; and opposite, the not less splendid Palazzo Pretorio, the palace of the Podesta. Of old the Piazza was less spacious, but in 1312 it was enlarged, and later, too, the palace of the Capitano, on the north, was destroyed. Here every Wednesday they still hold the corn-market, and every Saturday a market of stuffs, silks, and tissues.
It was S. Romolo who first brought the gospel to Pistoja, and the tradition is that he converted a temple built by the Romans to the God Mars into a church, on the spot where now the Duomo stands,[140] and indeed in 1599 certain inscriptions were found, and the capitals of some Roman columns. It is generally thought that a church was built here in the early part of the fifth century, dedicated to St. Martin of Tours, on whose day Stilicho, that Roman general who was by birth a Vandal, gained a victory over Radaugasius and his army of some 400,000 Goths, who had ravaged the country as far as Florence in 406. However this may be, in 589 the church was finally rebuilt, and certainly re-dedicated to S. Zenone, the Bishop of Verona, who, so it was said, had saved the Pistojese from the floods by breaking through the Gonfolina Pass, that narrow defile beyond Signa through which the Arno flows, with the Ombrone in her bosom, into the Empolese. After being dedicated at various times to many saints, in 1443 it was given to S. Zenone,