During the excavations of St Nedelya Square in present-day Sofia archeologists found for the first time traces of prehistory in the very center of Sofia and in one of the excavated buildings were found clay bellows and coin cores. This gives rise to a hypothesis that the mint of Serdica was probably located there.
Despite of the found artifacts, it is still not clear whether the mint of Serdica was located in the center of the ancient city as this activity was forbidden in the center of the city due to a fire hazard. Traces of a mint were found in the eastern premises of the building – a layer of coins of the Roman Emperors Gallien, Aurelian, Claudius II and others from the period before the 4th century. In this period in Serdica operated a state mint that did not coin on behalf of the city government, but with the emperor's permission – thus, a completely different category of money.
Archeologists also found a pot with 2976 silver coins including rare face values as well as a coin of an emperor who ruled for only 86 days. The coins had been collected over a long period –from the time of the Roman Emperor Nero to that of Caracalla and Geta. Among the found 111 coins of Emperor Domitian there were no two identical coins – the images on the back of the coins are different.
The second big surprise is the found evidence of human presence in the Sofia field 7000 years ago. Because of the valuable finds during the excavations there will be a new resolution regarding the square. Sofia Municipality continues to invest in the study and presentation of the cultural and historical heritage of Sofia, and the growth of the number of tourists proves that these investments are worth it.