Castle & fortressDalmatia

St. Nicholas Fortress: the Venetian sea fort guarding Šibenik

St. Nicholas Fortress (Tvrđava sv. Nikole) is a Venetian sea fort on the islet of Ljuljevac, at the entrance to St. Anthony Channel near Šibenik in central Dalmatia. Raised in the 16th century to stop Ottoman ships reaching the harbour, it is one of the best-preserved examples of defensive architecture in the region, and part of a UNESCO World Heritage listing since 2017.

This fortress was built of brick, in a region of stone, and the brick was shipped in from the Veneto. It guarded Šibenik's channel from Ottoman ships, yet its defences were never put to the test in battle.

WhereOn the islet of Ljuljevac, at the entrance to St. Anthony Channel near Šibenik, central Dalmatia

Type16th-century Venetian sea fortress with three bastions, UNESCO World Heritage Site

Best forFortification and sea-view lovers, history fans, UNESCO sites

Getting thereLies at the sea entrance to the Šibenik channel, opposite the lighthouse on the Jadrija beach

The history of St. Nicholas Fortress

The fortress owes its existence to the Ottoman advance. When the town of Skradin fell to the Ottomans in 1522, they gained a convenient base for sea links with the interior they had already conquered, and Šibenik and its harbour came under threat. The harbour could be entered only through the narrow St. Anthony Channel, so the place for a new fortress was obvious. In the Middle Ages, two small towers on either side of the channel had stretched a chain across it to keep unwelcome ships out; they were demolished once the fortress was built.

A proposal to build a fortress existed already in 1524. On 30 April 1525, at the request of the people of Šibenik, the Venetian captain Alvise Canal decided to build a fort on the islet of Ljuljevac. Work began in 1540, when the Sanmicheli family of military engineers, the elder Michele and his nephew Giangirolamo, arrived in Dalmatia. Giangirolamo is credited with the plans, which included improving the existing fortifications as well as new defences. French Wikipedia gives the building period as 1540 to 1547, with a garrison in place from 1544.

The islet already held a Benedictine monastery of St Nicholas, which gave the fortress its name. It was demolished, together with its church, which was replaced by a small chapel on the north-western part of the fortress terrace. Giangirolamo designed a solid, triangular fortress with three prominent bastions, built on a ridge and using the living rock in part. Its lower zone, the parts below and just above sea level, is of stone; above it the walls are of brick, usual for the period but unusual for Dalmatia. The brick was shipped from the Veneto. The fortress was armed with 32 cannons.

Its defensive capabilities were never tested in military operations, but the structure still proved successful in protecting the town from attacks from the sea. Over the centuries it served various armies and was renovated several times, partly because of developments in weaponry. The military abandoned it completely in 1979. After two years of reconstruction, it opened to visitors in July 2019. In 2017 it had been inscribed on the UNESCO World Heritage List as part of the Venetian Works of Defence between the 16th and 17th centuries: Stato da Terra – western Stato da Mar.

Curiosities about St. Nicholas Fortress

Of Šibenik's four fortresses, St. Nicholas is the only one at sea; the other three stand on land.
The fortress is built of brick, a material then thought to be most resistant to cannonballs, on stone foundations.
The brick was brought from the Veneto, a sign of how much importance the builder gave to the material.
Italian Wikipedia calls it one of the rare triangular fortifications and one of the earliest examples of the so-called horn or tenaille work.
English Wikipedia notes two similar forts in the Mediterranean, one on Malta and one in Venice, the Forte di Sant'Andrea.
The fortress is named after the Benedictine monastery of St Nicholas, which had to be demolished to make room for it.

Tours near St. Nicholas Fortress

Experiences in the area that you can book online with Viator:

Etnoland MULTIMEDIA EXPERIENCE Skip-the-line

★ 5 (66 reviews) · 1 h

See details ›

Sibenik Old Town Private Walking Tour Experience

★ 5 (16 reviews) · 1.5 h

See details ›

The Best of Sibenik Private Walking Tour

★ 5 (16 reviews) · 1 h

See details ›

Private Krka Waterfalls Tour with Wine Tasting from Sibenik

★ 5 (11 reviews) · 6 h

See details ›

Visiting St. Nicholas Fortress

The fort lies on the left (southern) side of the entrance to St. Anthony Channel, so the setting is as much part of the visit as the walls themselves.
According to French Wikipedia, a causeway of about 70 m links the islet to the neighbouring Školjić islet, itself linked to the mainland by a raised passage about 150 m long.
Look for the triangular layout with its three bastions, the brick walls above the stone base, and the small chapel on the terrace.
The fortress opened to visitors in July 2019 after a two-year reconstruction. Check the current opening hours and access arrangements before you go.
Šibenik's three other fortresses, St. Michael's, St. John's and Barone, stand on land and can be combined with a visit.

Opening hours, access and conditions can change. Check before you go.

Map: where St. Nicholas Fortress is

Map: © OpenStreetMap contributors

Photos of St. Nicholas Fortress

Questions

Where is St. Nicholas Fortress?

It stands on the islet of Ljuljevac at the entrance to St. Anthony Channel, near Šibenik in central Dalmatia, opposite the lighthouse at Jadrija beach.

Why was St. Nicholas Fortress built?

It was built to protect Šibenik's harbour from Ottoman ships after the fall of Skradin in 1522 gave the Ottomans a base for sea routes.

Who designed St. Nicholas Fortress?

The plans are credited to Giangirolamo Sanmicheli, of the Venetian military-engineering family Sanmicheli. Some sources also name his uncle Michele.

Is St. Nicholas Fortress a UNESCO World Heritage Site?

Yes. It was inscribed in 2017 as part of the Venetian Works of Defence between the 16th and 17th centuries: Stato da Terra – western Stato da Mar.

Why is the fortress made of brick?

Brick was then considered the material most resistant to cannonballs. It was shipped in from the Veneto and sits on stone foundations.

Is St. Nicholas Fortress open to visitors?

It opened to visitors in July 2019 after two years of reconstruction. Check the current opening hours and access arrangements before you go.