Perperikon is considered to have been a famous sanctuary and oracular shrine dedicated to the worship of Dionysus, the Greek god of fertility, by the Bessi, an independent Thracian tribe.

[3] In 2005, German scholars from the University of Heidelberg confirmed that the two rather small fragments discovered by Ovcharov in the Eastern Rhodopes mountains are written in the Minoan Linear A script from about 15th century BC.

Tatul has been recognised as an exclusive religious centre in the region which according to Ovcharov was the site of the sanctuary and tomb of an influential Thracian leader who was deified after his death.

[4] In conjunction with his work in Perperikon and Tatul, Ovcharov has led archaeological expeditions in Georgia, Greece, Montenegro, the Republic of North Macedonia, Russia, Serbia, and Turkey.

[9] As part of the initiative, Ovcharov and Pavlov gave lectures exploring the history and culture of Bulgaria in universities and embassies across the globe, including in China, India, Russia, and Switzerland.