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Heraclea Sintica was an hellenistic polis built in ancient Greek style by Philip II of Macedon. It was located in Thracian Macedonia, in the district of Sintice, to the east of the Strimon, the site of which is marked by the village of Rupite, in today Bulgaria. The polis was identified by Assoc. Prof. Georgi Mitrev (University of Plovdiv) after the accidental discovery of a large Latin inscription in 2002. In essence, this is letter of Emperor Galerius and Caesar Maximinus II of 308 years in which the rulers are turning to Herakleians in response to their request to reclaim the lost city rights. Before 2005 Assoc. Prof. Georgi Mitrev published another inscription, which mentions Guy Lucius Skotussaios and Harakleios. It proves conclusively that this is precisely Heraclea Sintica, not another Herculaneum or Heraclea, as this name is very popular in the ancient world.
Since 2007 began archaeological excavations at Heraclea Sintica, led by Assoc. Prof. Lyudmil Vagalinski, of the National Institute with Museum of Archaeology in Sofia. They noticed strange structures above it: tunnels and an arch. Later on, after geosonar examination by Russian specialists, a large studio for producing ceramic masks for an unknown and as yet undiscovered ancient theatre was discovered.