Källunge church (Källunge kyrka) is a church in the island-bishopric of Visby on Gotland. The church is richly decorated with reliefs and frescoes. The frescoes are important evidence of the strong Byzantine influence on Swedish art of the 12th and 13th centuries. An early depiction of a nyckelharpa is found in a relief dating from circa 1350 on one of the gates of the church.
The church gives its name to the Källunge codex (Latin Codex Kellungensis) a 1622 collection of choral music by Philipp Dulichius, Melchior Vulpius, Gregor Aichinger, Nicolaus Zangius,Hieronymus Praetorius, Hans Hassler, Jacobus Gallus, Johann Walter, Dominique Phinot, Orlando di Lasso, and Johann Bahr among others. The collection was discovered in 1913, though only the alto part is extant. 100 of the 315 pieces have been identified from other collections.
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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.