The discovery a medieval cemetery in the village of Ciepłe, northern Poland, include graves from the times of Bolesław the Brave, the first King of Poland, who lived from 967 to 1025.
Despite being already looted by treasure hunters the cemetery find sheds new light on the Yotvingian people.
The six were found in a “house of the dead” and cast new light on ancient burial rituals.
With a population of just 445 people, the former medieval stronghold has turned up thousands of fragments of ceramic vessels, coins and amulets - and even a sacrificed dog’s skull buried under the threshold of a house.
The lead seal carries the name of Nicholas III who was pope from 1277-1280.
Archaeologists have discovered traces of an early Middle Ages cemetery during excavation work close to Old Town in Lublin, eastern Poland.