Monasterio de San Salvador in Cornellana is a monastery located in the municipality of Salas. Consisting of several Romanesque style buildings which started to be built in the 11th century, the monastery was founded by infanta Cristina Bermúdez, daughter of Bermudo II of León and his first wife Queen Velasquita Ramírez. She founded the monastery in 1024 after the death of her husband, infante Ordoño Ramírez 'the Blind', son of Ramiro III of León and his wife Sancha Gómez. Cristina lived in the monastery as a nun and was buried there.
After her death, the monastery was divided among her heirs, her sons and daughters; Alfonso, Aldonza, Ordoño, and Pelaya Ordóñez. A great-grandson of Cristina, the powerful Count Suero Vermúdez in 1120 donated the monastery to the Abbey of Cluny and then to the Cathedral of Oviedo.
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.