St. John’s Fortress in Dubrovnik – Entrance to the City Walls
St. John’s Fortress (Croatian: Tvrđava sv. Ivana), a key stronghold of the Republic of Ragusa (Dubrovnik), once guarded the historic harbor of one of the Adriatic’s most vital trading hubs.
Today, it serves as one of the three main entrances to the Dubrovnik City Walls. Additionally, your City Walls ticket also grants you access to Fort Lovrjenac (St. Lawrence Fortress).
Strategically, the city was defended by:
- Minčeta Fort to the north
- Bokar and Lovrjenac Forts to the west
- Revelin and St. John’s Forts to the east
A Brief History
Situated on the southeastern edge of the city harbor, St. John’s Fortress is one of the most critical defensive structures in Dubrovnik’s fortification system. It is a cornerstone for understanding the maritime heritage of this historic Mediterranean city-state.
The fortress’s origins date back to 1346 when the first structure, known as the “Fort of the Pier” (Tvrđava od mula), was built. Nearby, the so-called Gundulić Fort was later constructed, designed by the prominent Ragusan engineer Paskoje Miličević. In 1522, the two forts were linked by defensive towers, and by 1557, they were fully integrated into the monumental, semi-circular fortress we see today.
Defending the Harbor
To the northeast, the harbor was guarded by the smaller Fort of St. Luke. To secure the port against unwanted vessels, a massive heavy-metal chain was stretched between St. John’s and St. Luke’s forts. This chain was so formidable that it could easily break the keels of invading ships.
The chain was eventually retired in 1484 after the construction of Kaše, a breakwater designed by Paskoje Miličević. Kaše not only shielded the harbor from rough seas and storms but also significantly bolstered Dubrovnik’s defenses against persistent threats of maritime invasion.
The Fortress Today
The fortress interior, which once housed a massive gunpowder magazine, now preserves a wealth of cultural treasures from the golden era of the Republic of Ragusa.
- The Ground Floor houses the Dubrovnik Aquarium.
- The First and Second Floors are home to the Maritime Museum.
- The Terrace serves as an atmospheric open-air stage for the Dubrovnik Summer Festival. It also displays a historic cannon salvaged from the Triton—a Habsburg Navy warship that tragically exploded and sank off the island of Lokrum in 1859, claiming the lives of 85 crew members.
Game of Thrones
While Dubrovnik is world-renowned as the primary filming location for King’s Landing, St. John’s Fortress itself was not heavily featured in any major Game of Thrones scenes.
Location
Dubrovnik
Dubrovnik is a stunning coastal city in southern Croatia, known for its beautiful architecture and rich history. The city’s old town is a UNESCO World Heritage Site, with its impressive walls, cobblestone streets, and Baroque buildings.
ExploreRenaissance
In the 15th century, Croatia was divided between three states – northern Croatia was a part of the Austrian Empire, Dalmatia was under the rule of the Venetian Republic (with the exception of Dubrovnik), and Slavonia was under Ottoman occupation. Dalmatia was on the periphery of several influences, equidistant from Italy, Ottoman Bosnia, and Austria, so it drew influence from all. In those circumstances in Dalmatia flourished religious and public architecture with clear influences of the Italian Renaissance, but still original.
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