Sofia Globe reports.
The ring, which was found at the fortress of Cape Kaliakra on the Black Sea, is small and would have probably been worn on the little finger. It has a box-like decoration that's hollow and has a small hole on the side that would be covered up by the ring finger. All the wearer would have to do is spread his fingers and the contents of the box would spill out, supposedly into someone's drink.
Similar rings have been found elsewhere in Europe, especially Italy and Spain.
It's of a style generally worn by men. The archaeologists theorize that it played a part in the political intrigues of the day, when aristocrats vied for control of Bulgaria and even played a role in Byzantine and Venetian politics.
Last year a vampire skeleton was found in Bulgaria. Sounds like it was quite the place in the good old days!