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Giecz village was once one of the main centres of Polish statehood in the early Middle Ages, alongside Poznań and Gniezno. In the early 9th century, a small keep was built on a mound on a peninsula on the Giecz lake; fortified with a stockade and earthworks. Since 940 it was one of the key strongholds of the early Piast dynasty. In 1038 during a war with Bohemia, the place was seized by Bretislaus I, who sacked the nearby settlement and sold its inhabitants into slavery. The place quickly recovered and by the 13th century was a centre of administration, trade and commerce in the Greater Poland region. At about that time, the settlement received a town charter and became the seat of a castellany. However, in 1331, it was burnt to the ground, never to recover.
After 1945, archaeologists discovered the remnants of a mediaeval pallatium, a pre-Romanesque rotunda, stone walls, a 13th-century palace and several sites of primitive iron-ore working.
Currently, Giecz is the site of ongoing excavations. There are two habitation phases being excavated at the same location. The first is a cemetery dated to the 10-11th century. The second, located just beneath the cemetery, is an earlier settlement. Features of this settlement include open earthen structures, hearths, storage pits, and rich culture layers.
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.