Hisn Yakka is the name given to an old Muslim fortress and town, predecessors of the current city of Yecla. It was inhabited between the 11th and 13th centuries, as the town was abandoned after 1266 after the Mudejar revolt and the new Christian settlers settled on the opposite side of the mountain.
Hisn Yakka was built at the end of the 11th century in the Almoravid period, but it was not until the 12th century that the town or Madina appeared on the sunny side.
After the Christian conquest of the kingdom of Murcia, the Muslim population became a vassal of the King of Castile, which made the living conditions of the population more difficult, discontent that caused the Mudejar revolt. A large part of the Mudejar population had to leave the area at the end of this revolt, and it is likely that this was also the end of Yakka.
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.