The grim discovery was made in an abandoned souls' graveyard in Pień near Bydgoszcz where last year the grave of a ‘vampire woman’ was also found.
The huge grave containing around 450 skeletons revealed that many of the bodies showed signs of anti-vampire practices common in Kashubia in the 19th century.
One of the most prominent Polish immigrants active in London in the early 1900s, Klemens Wierzbicki’s grave was rediscovered by chance after both his UK-based great-granddaughter Veronica Ward and a group of London-based Polish researcher-historians were put in touch by a worker at St Patrick's Cemetary in Leyton.
Archaeologists exhuming the grave in the town of Barborów came across bullet-ridden helmets, broken bones, dog tags, coins, Swastika badges, shoes, a whistle and a chain with a lucky horseshoe.
Most of the 11 Polish victims had their hands tied behind their backs, and some of the skulls have traces of injuries. The mass grave contained bullet casings from a German Mauser.
The Belarusian authorities have destroyed a Polish war grave containing the remains of four underground resistance soldiers killed by the Germans in 1943.
The grim discovery of around 17.5 tons of human ashes were made near the former Soldau concentration camp, which is now the town of Działdowo by the Institute of National Remembrance.
Murdered by communists in Lublin Castle in 1949, the whereabouts of Henryk Wieliczko’s body remained unknown for six decades.
Although it was known that King Olbracht had been buried in Wawel Cathedral, the exact location had until now remained a mystery, believed only to have been under the floor somewhere in the middle of the chapel.
Piotr Włodarczak from the Institute of Archeology and Ethnology of the Polish Academy of Sciences said the remains of the men, which are significantly taller than earlier finds, most likely belonged to people who arrived from the steppes of southern Russia or Ukraine.