Vyborg Castle was one of the three major castles of Finland. It was built as the easternmost outpost of the medieval Kingdom of Sweden: it is located on the Karelian isthmus, on a little islet in the innermost corner of the Gulf of Finland. It was originally constructed in the 1290s. The town was originally located inside the outer fortifications of the castle, at the fortress island, but it had to be moved to its present location out of the island because of lack of space.
The construction of the fortress started in 1293 by orders of Torkel Knutsson, the Lord High Constable of Sweden who made in 1290s a so-called crusade to Karelia, the so-called Third Finnish Crusade, actually aimed against Russians, i.e.Novgorod. He chose the location of the new fortress to keep the Bay of Vyborg, which was a trading site used by locals already for a long time. From the bay, a river way goes inland, ultimately connecting the place to several districts, lakes, and indirectly also to rivers going to Ladoga.
The three high-medieval Finnish "castle fiefs" were ruled from the castles of Turku, Hämeenlinna and Viipuri, respectively until the 1360s. The castle became the stronghold of the Swedish realm in Karelian regions. Throughout the centuries, it was the first defence of the kingdom against Russians. Its military and strategic status was in the late Middle Ages only second to the fortified capital Stockholm.
The castle and the large surrounding fief became a virtually autonomous principality. Its governors were usually fiefed with the incomes of the county. The fief of Viborg became known as a margraviate. Its governors were generally from the most powerful families of the kingdom. They enjoyed large administrative powers and a good distance from the capital. Those realities made them practically independent rulers. Usually, the castle of Olavinlinna (built in 1470s) was subjugated to Viipuri.
Prominent figures who held Viipuri as their fief, were Bo Jonsson Grip, Christer Nilsson Vasa (1417–42), Karl Knutsson Bonde (1442–48, the future king), Eric Axelsson Tott (1457–81), Knut Posse (1495–97), Sten Sture the Elder (1497–99, between his regencies), Eric Bielke and count John of Hoya. Particularly in 1440s and in late 15th century, the fortresses were further enlarged.
The first mention of firearms in Finland relates to Viborg castle, in 1429. During the Middle Ages the castle was repeatedly besieged by the Russians, most famously in 1495, during the Russo-Swedish War (1495–1497). Governor Knut Posse was in office 1495-1497. The situation of the defenders looked hopeless, but they were saved by the Viborg blast on 30 November 1495, a mysterious explosion which scared off the Russians because they reportedly saw a St. Andrew's cross in the sky.
In the 16th century, much was renovated and additions made. In the 17th century, the castle was allowed to decay, as Russian danger was decreased and the border was much more eastwards. Vyborg was taken by the Russians in 1710, but passed back to Finnish hands in 1812 when all of Old Finland was attached to the autonomous Grand Duchy of Finland. The castle owes its present appearance to extensive restorations undertaken in the 1890s. The military of the Russian Empire used the castle until 1918 for housing administration. Viipuri belonged to the independent Republic of Finland between 1917–1940 and again 1941-1944. As a result of border changes in World War II it was annexed by The Soviet Union in 1944.
The main castle, located in the eastern part of the islet on its highest hill, has an irregular four-cornered layout, with the immense tower of St. Olav (Pyhän Olavin torni in Finnish) as its biggest section. It is 3-4 stories tall, varying in places. Outer defensive works surround the main castle, following the islet's coastlines. Today it functions as a museum.References:
From its origin as a small stronghold built by the ancient Illyrian tribe Dalmatae, becoming a royal castle that was the seat of many Croatian kings, to its final development as a large fortress during the Ottoman wars in Europe, Klis Fortress has guarded the frontier, being lost and re-conquered several times. Due to its location on a pass that separates the mountains Mosor and Kozjak, the fortress served as a major source of defense in Dalmatia, especially against the Ottoman advance, and has been a key crossroad between the Mediterranean belt and the Balkan rear.
Since Duke Mislav of the Duchy of Croatia made Klis Fortress the seat of his throne in the middle of the 9th century, the fortress served as the seat of many Croatia"s rulers. The reign of his successor, Duke Trpimir I, the founder of the Croatian royal House of Trpimirović, is significant for spreading Christianity in the Duchy of Croatia. He largely expanded the Klis Fortress, and in Rižinice, in the valley under the fortress, he built a church and the first Benedictine monastery in Croatia. During the reign of the first Croatian king, Tomislav, Klis and Biograd na Moru were his chief residences.
In March 1242 at Klis Fortress, Tatars who were a constituent segment of the Mongol army under the leadership of Kadan suffered a major defeat while in pursuit of the Hungarian army led by King Béla IV. After their defeat by Croatian forces, the Mongols retreated, and Béla IV rewarded many Croatian towns and nobles with 'substantial riches'. During the Late Middle Ages, the fortress was governed by Croatian nobility, amongst whom Paul I Šubić of Bribir was the most significant. During his reign, the House of Šubić controlled most of modern-day Croatia and Bosnia. Excluding the brief possession by the forces of Bosnian King, Tvrtko I, the fortress remained in Hungaro-Croatian hands for the next several hundred years, until the 16th century.
Klis Fortress is probably best known for its defense against the Ottoman invasion of Europe in the early 16th century. Croatian captain Petar Kružić led the defense of the fortress against a Turkish invasion and siege that lasted for more than two and a half decades. During this defense, as Kružić and his soldiers fought without allies against the Turks, the military faction of Uskoks was formed, which later became famous as an elite Croatian militant sect. Ultimately, the defenders were defeated and the fortress was occupied by the Ottomans in 1537. After more than a century under Ottoman rule, in 1669, Klis Fortress was besieged and seized by the Republic of Venice, thus moving the border between Christian and Muslim Europe further east and helping to contribute to the decline of the Ottoman Empire. The Venetians restored and enlarged the fortress, but it was taken by the Austrians after Napoleon extinguished the republic itself in 1797. Today, Klis Fortress contains a museum where visitors to this historic military structure can see an array of arms, armor, and traditional uniforms.