The Tržan Castle is a ruined medieval castle above the village of Modruš. Having been built on a ridge of a steep hill 670 metres above sea level on the eastern slopes of the Velika Kapela mountain, the castle was at a strategic place overlooking the road that connected the Adriatic Sea and the Pannonian Basin since ancient times.
According to the famous Croatian historian Vjekoslav Klaić (1849–1928), a kind of a castle or stronghold most probably existed above Modruš already at the beginning of the 9th century, during a war between Borna, Duke of Dalmatian Croatia, and Ljudevit Posavski, Duke of Pannonian Croatia.
Almost ideal position, dominating over the surrounding area, made Tržan Castle never to be conquered by anyone in its history, although the town of Modruš below the castle was plundered and burned by the Ottomans in 1493, just before the battle of Krbava Field.
From 1193 the castle was property of the Princes of Krk, (later, from around 1430, known as the Frankopans), a distinguished Croatian noble family. Bartol II Krčki was given the whole vast Modruš estate, including the castle, by the Croato-Hungarian king Bella II (III) for his merits in the wars he fought. The next more than 350 years Tržan was owned by the Frankopans as the main seat and stronghold of the family. They reconstructed and enlarged the old, irregular shaped castle, which was from around 1437 called Tržan or Tržan-grad, because of an increased trade that was going on there.
The walls, bastions and towers were built of hewn stone (ashlar) in the fishbone style and represented a kind of masterpiece of the contemporary building skill. There are some signs which indicate that the foreign building masters took part in the works, most probably those from the Republic of Venice. The castle itself consisted of central part with a large guard tower and a palace as residence for members of the princely family with its supporting staff, northern part with outbuildings for economic services, various workshops, warehouses, water tanks and rectangular defending tower, and southern part containing mostly facilities for retail trade, accommodation for traders and travellers etc. Following the walls and bastions of the castle, there were defensive walls, about 1,200 metres long, around the town of Modruš, descending the slope of the hill.
Bernardin Frankopan (1453–1529), the only son of Stjepan III, successfully managed the whole of his property further from the Tržan Castle, although there was increasing threat of the Ottoman raids from the already conquered Bosnian territory, east of Modruš County. This led to decrease of importance of Tržan by the end of the 15th century, and the population of the whole area started to move away more and more from its old places of residence to the other, safer parts of Croatia and neighbouring countries, not willing to live in endangered territory.
In the first half of the 16th century the castle was always less maintained and repaired than needed, and after 1553 came under control of the military authorities of the Croatian Military Frontier. A relatively small military deployment unit was permanently stationed there. After several unsuccessful attempts to renovate or rebuild the more and more severely damaged parts of the castle during the 17th and 18th century, the military authorities decided in 1791 to abandon it. Following the negligible Ottoman danger at that time, they presumed that it was not necessary to keep soldiers in Tržan and it was left to its own destiny, becoming a badly damaged castle ruin today.References:
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The monumental staircase on which the remains of one hundred thousand fallen soldiers are lined up and which has at its base the monolith of the Duke of Aosta, who was the commanding officer of the third Brigade, and gives an image of a military grouping in the field of a Great Unity with its Commanding Officer at the front. The mortal remains of 100,187 fallen soldiers lie here, 39,857 of them identified and 60,330 unknown.