People believed the rod would pin the dead into their graves and stop them from becoming vampires
'Vampire' Skeletons Found In Bulgaria Near Black Sea -- BBC
Archaeologists in Bulgaria have found two medieval skeletons pierced through the chest with iron rods to supposedly stop them from turning into vampires.
The discovery illustrates a pagan practice common in some villages up until a century ago, say historians.
People deemed bad had their hearts stabbed after death, for fear they would return to feast on humans' blood.
Similar archaeological sites have also been unearthed in other Balkan countries.
Bulgaria is home to around 100 known "vampire skeleton" burials.
Searchers stumbled across the latest two specimens, dating back to the Middle Ages, in the Black Sea town of Sozopol.
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My Comment: I guess the vampire legends have a little truth to it.