The discovery has kicked off an archaeological expedition to the area in the hope of finding more artefacts from the time period.

The sword itself, a 4-foot, 3.3-pound, two-handed longsword, is in remarkable condition considering it is 600 years old. The blade is almost fully intact, and the only part of the sword missing is the hilt, which was likely made from bone or wood.

The sword is now in the possession of the Fr. Stanisław Staszic Museum, which is in the process of analysing the blade. Among the discoveries the museum has made so far: the sword has a marking in the handle of a small cross inside a shield, likely the signature of the blacksmith that made it.

The archaeologists studying the sword haven’t identified any damage to the sword that would have caused its owner to discard it. Chances are, this sword was dropped or lost as the knight carrying it was crossing the bog, or perhaps off the side of a boat if the bog was a lake or pond in the 14th century.

In an extreme case, the knight may have been pulled down into the bog along with his sword, and the museum archaeologists are conducting an expedition in the area in the hopes of finding additional evidence to support that hypothesis.