The Cross from the 10th century made of tin was found in the cradle of Wrocław – in Ostrow Tumski. It resembles the objects created within the artistic circle of Great Moravia, and this first Christian monarchy in the Slavic region was converted in the 60’s of the 9th century by brothers from Thessaloniki – Saints Cyril and Methodius. It can constitute proof of early Christian influences of Great Moravia on Silesian lands. Moreover, the artifact was found in layers dating back to the times after the fall of Great Moravia in 906, when in Ostrow Tumski there was a castle built in the 40’s of the 10th century. It is assumed that it remained in the zone of influences of Bohemia which was a part of Great Moravia, but it did not have to be a permanent dependency. Most of all, the castle was supposed to ensure the safety of the local community, most probably related with the tribe of Silesians, in a crucial point of crossing the Oder River. When in the 80s of the 10th century the lands on the river were taken by the creator of the Polish statehood Mieszko I, in Ostrow Tumski a new castle was built. In 1000 Wrocław became the capital of diocese led by Bishop John. Thietmar from Merseburg, a chronicler, wrote about it and he also provided the oldest reliable inscription of the name of the city – “Wortizlava”.