| Description: | In the Bulgarian lands they have lived warlike Thracians, passed the military expeditions of the Persian king Darius I and the Macedonian kings Philip II and Alexander the Great. It took Rome more than 150 years of fighting, until ancient Thrace became its province. There are invasions of the Celts on the Balkan Peninsula and their state survived 80 years in the southeast of the Balkan Mountains. These lands have seen Goths, Huns, Avars and Slavs in numerous battles with the Eastern Roman Emp |