The castle in Severin na Kupi is mentioned for the first time in 1558. The Frankopans erected it above the steep bank of the river Kupa, whilst along with the tower the chronicles also mention a wooden castle from the same period. After the death of the last of the Frankopans and the failure of the Zrinski-Frankopan Conspiracy in 1671 this building was also looted and ruined.
The castle gained its current appearance with a renovation in 1803, during the time of Duke Ivan Oršić. It is a two-storey building of a rectangular ground plan, corners reinforced with cylindrical towers and with an interior courtyard and arcade columns. The Chapel of St Florian, located within the castle complex, has small dimensions with an emphasised arched doorway and turret. Alongside the castle is a garden, which is protected and has been declared as a monument of landscape architecture.
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.