The Thracians were skillful craftsmen. They made beautifully ornate golden and silver objects such as various kinds of vessels, rhytons, facial masks, pectorals, jewelry, weapons, etc. These show strong, and increasing, influence from the neighbouring cultures, especially the Greeks. They used to bury rich hoards of precious objects both to hide them in times of enemy invasions and unrest as well as for ritual purposes. To date, more than 80 Thracian treasures have been excavated in Bulgaria, the cradle of the Thracian civilization. Refer to the map which explicitly shows the territory of present-day Bulgaria.
^The Oxford Classical Dictionary by Simon Hornblower and Antony Spawforth, ISBN0-19-860641-9, page 1514,"The kingdom of the Odrysae, the leading tribe of Thrace extended in present-day Bulgaria, Turkish Thrace (east of the Hebrus) and Greece between the Hebrus and Strymon except for the coastal strip with its Greek cities."
The Yurta-Stroyno Archaeological Project. Studies on the Roman Rural Settlement in Thrace. P. Tušlová – B. Weissová – S. Bakardzhiev (eds.). Prague: Charles University, Faculty of Arts, 2022. ISBN978-80-7671-068-9 (print), ISBN978-80-7671-069-6 (online: pdf)