St Twrog's Church is a small rural church at Bodwrog in Anglesey, North Wales. Built in the late 15th century in a medieval style, some alterations have been made but much of the original structure still remains. It has two 15th-century doorways (one later converted into a window) and some 15th-century windows. The bull's head decoration used on the church denotes a connection with the Bulkeleys of Beaumaris, a prominent north Wales family over several centuries. Set in a remote part of the countryside in the middle of Anglesey, it is dedicated to St Twrog, who was active in the late 5th and early 6th centuries. The church's tithes were paid for at least two hundred years to Jesus College, Oxford, which has historically strong links with Wales, and the college at one point built a house for the priest who served St Twrog's and a neighbouring parish.
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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.