The University of Catania is the oldest university in Sicily and the 13th oldest in Italy.
The university was founded by King Alfonso V of Aragon (who was also King Alfonso I of Sicily) on 19 October 1434. Alfonso V with this gesture wanted to compensate the city (in which there had been recently established the Royal Court) for moving the Sicilian capital from Catania to Palermo. The activity of the Atheneum actually started a year later, in 1445, with 6 professors and 10 students. The first four faculties were Medicine, Philosophy, Canon and Civil Law and Theology. Lessons were initially held in a building in Piazza del Duomo, next to the Cathedral of St. Agatha, and eventually moved to the Palazzo dell'Università in the late 1690s. This building remains the seat of the university to this day.
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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.