Archaeologists hypothesize they may have discovered the 3rd-4th century AD mint of the Ancient Roman city of Serdica, the predecessor of today’s Bulgarian capital Sofia, as a result of excavations in downtown Sofia! Read about it here! “We’ve come to a layer with material from the end of the 3rd and the beginning of the 4th century in which we have discovered slag and bellows for fanning up fire for metal smelting," lead archaeologist Veselka Katsarova from the Museum of Sofia History, has told bTV. She adds that the layer in question contains coins from the time of Roman Emperors Gallienus (Gallien) (r. 253-268 AD), Claudius II (r. 268-270 AD), and Aurelian (r. 270-275 AD) up until the beginning of the 4th century AD. “We are finding slag, and clay fragments from bellows… There are metal particles stuck to the bellows fragments," she has elaborated, as cited by BNT.