Once the largest city-fortress in the entire Republic of Venice, Zadar’s walls allowed it to retain more of its independence than most of its neighbouring cities, and meant that it was never captured by the Turks.
The most impressive gate of the walls was Land Gate - then the main entrance into the city - in the little Foša harbour, built by a Venetian architect Michele Sanmicheli in 1543. It is considered one of the finest monuments of the Renaissance in Dalmatia, and has the form of a triumphal arch with a central passage for wheeled traffic, and two smaller side arches for pedestrians. It is decorated with motifs such as St. Chrysogonus (Zadar’s main patron saint) on his horse, and the Shield of St. Mark (the coat of arms of the Republic of Venice). Previously, the area had been highly defensive, with a surrounding moat.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.