Built on the remains of a Roman Arx during the Lombard era, the Caiazzo Castle was owned by notable figures like Count Theodoric of Caiazzo (9th century) and Count Landone (1034). Later, it fell under Norman rule and was fortified by Roger II with permanent garrisons.
In 1229, during the Hohenstaufen period, Caiazzo was besieged by John of Brienne but was freed by Emperor Frederick II, who stayed at the castle. Under the Angevins, it changed hands multiple times, eventually belonging to Lucrezia d'Alagno in 1461, who reinforced the walls against artillery fire.
In 1569, Matteo di Capua owned it, hosting poet Giovan Battista Marino. The Corsi family acquired it in 1607, followed by Giuseppe Andrea De Angelis in 1836, who heavily remodeled it, altering its medieval appearance.
The quadrangular castle sits atop a hill overlooking Caiazzo and the Volturno Valley. It has four towers: three round limestone ones and the square Torre di Lucrezia, named after Lucrezia d'Alagno. This tower includes multiple residential levels with vaulted ceilings and large windows, ending with a defensive rooftop.
The castle has two entrances, one near Torre di Lucrezia and another at the end of an old moat. The lower level retains its medieval service rooms with ogival arches, while a staircase leads to the 12th-century church of Santa Maria al Castello and the remodeled 19th-century residential quarters.
Nearby, remnants of Samnite polygonal walls from the 4th century BCE can be seen.
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.