Oponice Castle was probably built in the second half of the 13th century by son Peter from the Csák clan. The castle was first mentioned in 1300 as 'Oponh'. Until the death of Máte Csák of Trencsén in 1321, Oponice Castle guarded part of his wide domain in the central Nitra area. The castle was later administered by the royal exchequer until it was passed in 1392 into the hereditary possession of Nicholas Ewres, founder of the Apponyi dynasty.
The castle was expanded and its defenses strengthened, particularly during the threat from Ottoman Turkey, allowing it to withstand enemy onslaughts. Unfortunately, a family dispute over land dating from 1612 meant the end of the castle, punctuated by a fire in 1645 which caused the castle owners to finally abandon it. From time to time the castle was used by the Kurucs, Hungarian insurgents fighting the Habsburgs, until Imperial forces conquered it and had the castle demolished in the early 17th century. The castle's aristocratic tradition remained bound to the Apponyis, who maintained and preserved it until the death of the final descendant from this family, Henrich Apponyi, in 1935.
The castle’s distinct silhouette covers the preserved gun bastion and northeast Renaissance castle up to the third floor.
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.