bank of the Miljacka there were once found Roman bricks and an inscription indicating a construction yard and, nearby, a bathhouse. The biggest known settlement in the region was known as ‘’Aquae S...’’ (probably Aquae Sulphurae) on top of present-day Ilidža. Middle Ages The Slavs came to Bosnia in the 7th century, but details of their movement and settlement through the country remain a mystery. Some Slavic artifacts remain from the time however, and it is fairly certain that they settled in the Sarajevo valley, replacing the Illyrians. Katera, one of the two original Bosnian towns that were mentioned as a part of Serbia by Constantine Porphyrogenitus in De Administrando Imperio, was found to the southeast of Sarajevo. By the time of the Ottoman occupation there was little settlement left in the region, leaving the history of the Sarajevo region during the Middle Ages not well understood. The first mentions of Bosnia describe a small region, which was basically the Bosna river valley, stretching from modern-day Zenica to Sarajevo. In the 12th century, when Bosnia became a vassal of Hungary, the population consisted primarily of members of the Bosnian Church. The area of present-day Sarajevo was part of the Bosnian province of Vrhbosna, near the traditional center of the kingdom. Though a settlement called Vrhbosna existed, the exact settlement of Sarajevo at this time is debated. During the High Middle Ages, various documents make note of a place called 'Tornik' in the region. By all indications, 'Tornik' was a very small marketplace surrounded by a proportionally small village, not considered very important by Ragusan merchants. Even the local fortress of Hodidjed was defended by a mere two dozen men when it fell to the Turks. Sarajevo also fell under siege. Others say that Vrhbosna was a major settlement located in the middle of modern-day Sarajevo. Papal documents indicate that in 1238, a cathedral dedicated to Saint Paul was built in the city. Disciples of the notable saints Cyril and Methodius stopped by the region, founding a church at Vrelo Bosne. Whether or not the city was located at modern-day Sarajevo, the documents attest to its and the region's importance. Perhaps a village existed on the outskirts of the city itself, near present-day Ilidža, one of the most attractive regions for settlement in the area, which had been significantly populated for pretty much every other period of its history. Vrhbosna was