Perpignan Cathedral construction was begun in 1324 by King Sancho of Majorca, and later finished in the 15th century. It replaced the Cathedral of Elna, and therefore the church was at first the seat of the Bishop of Elne, and then, from 1602, of the Bishop of Perpignan.
The cathedral was built in the Catalan Gothic style, because of its association with the Kingdom of Majorca. It has a wide nave (80 meters long, 18 m wide, and 26 m tall) made of seven cross-vaults, and features a short transept and apse, whose vault features seven keys.
The cathedral's western façade was never finished. When being restored in the 19th and 20th centuries, the Gothic window of the façade was rebuilt, as it had previously been substituted by a simple rectangular opening. The façade also features a portico and clock-tower, which date from the 18th century.
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.