The Agora of Thasos was the political, administrative and religious centre of the ancient city of the island and is the most important archaeological monument complex, which took its final form over many centuries. Early structures have been identified dating from the 6th century BC. This was a public square which was enclosed by colonnaded arcades, which formed the façade of public complex and stood out for the so called “Diodos ton Theoron”, which was one of the most important sites of the city bearing religious significance.
In the complex were discovered sculptures, statues and invaluable inscriptions, many of which are now in the Louvre museum in Paris.
In the northwestern part there is the sacred shrine of Thassian Agoreous Zeus with circular enclosure of marble columns and slabs of stone, also the tomb of Glaucus, the circular altar of Theagenes, who was one of the most glorious Thassian athletes, the altar of Gaios and Lefkios Caesar, the marble bow and the early Christian Basilica of Agora with dimensions that allowed a great number of believers to attend mass.
The Agora of Thassos was brought to light during the excavations conducted by the French Archaeological School that begun in 1911. The bulk excavation and revelation of the site took place from 1948 to 1955. The excavation of the French Archaeological School continues at the same place until this date.
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.