At one time, Zadar was the largest fortified city in Venice's portfolio. Today the walls and military facilities once devoted to defense are used as parks and backdrops for walking paths. Some sections of the walls were built by the Romans, and some were built by the Venetians much later as fortification against the Turks, who mounted relentless attacks on the city during the Middle Ages. Today only portions of the walls and four gates remain. The most impressive of these is the Land Gate on Fosa Harbor, built by the Venetians in 1543 and decorated with sculptures that include the winged lion of St. Mark and the city's coat of arms. The Sea Gate is behind the Church of St. Chrysogonus between the ferry port and the market. It contains part of a Roman arch, but it was redone by the Venetians in 1573 to celebrate a Christian victory over the Turks. The gate is adorned with a relief of St. Mark's lion on the side facing the sea and is dedicated to Pope Alexander III, who visited Zadar in 1171. It also has a plaque noting the visit on the gate's land-facing side, and the street leading up to it is named Alexander. The Bridge Gate is the newest opening in the wall, cut through to Narodni Trg by the Italians in the 1930s. The last and smallest gate is St. Rocco Gate. It connects Three Wells Square with the harbor.