Two of the skeletons were preserved in coffins, while the others were buried in soil beneath the wall of Kalmar Castle, which is more than 800 years old and is one of southern Sweden's most famous historical sites.
Magnus Stibeus, a spokesperson from the Swedish History Museum, which led the excavation project, said that the discovery was made in March this year while two archaeologists were searching the area, which had been made available to them as repairs took place on the castle's walls.
He said it remained a mystery how the people had died, but added that they could be castle staff who became sick in the late 1400s or early 1500s.
At the time the people dug up this spring are understood to have died, Sweden and Denmark were still part of the Kalmar Union, a state that brought together the two Scandinavian nations along with Norway, but formally split up in 1523 when Gustav Vasa became King of Sweden.
