The puzzling depiction of a vicious predator — either a dragon or a snake — devouring a frog on an early medieval belt buckle from the Czech Republic may be a symbol from an unknown pagan cult, archaeologists say.

The bronze belt fitting or buckle was found by a metal detectorist near the village of Lány, about 20 miles (32 kilometers) west of Prague.

Archaeologists first thought the central design — a snake or dragon devouring a frog-like creature — must be unique. But they have since learned that in the past dozen years, almost identical artifacts have been unearthed in Germany, Hungary and elsewhere in the Czech Republic.