Wikipedia
Szczerbiec is the coronation sword that was used in crowning ceremonies of most Polish monarchs from 1320 to 1764. It is currently on display in the treasure vault of the Royal Wawel Castle in Kraków as the only preserved piece of the medieval Polish Crown Jewels. The sword is characterized by a hilt decorated with magical formulas, Christian symbols and floral patterns, as well as a narrow slit in the blade which holds a small shield with the coat of arms of Poland. Its name, derived from the Polish word szczerba meaning a gap, notch or chip, is sometimes rendered into English as "the Notched Sword" or "the Jagged Sword", although its blade has straight and smooth edges.
A legend links Szczerbiec with King Bolesław I the Brave who was said to have chipped the sword by hitting it against the Golden Gate, Kiev (now in Ukraine) during his intervention in the Kievan succession crisis in 1018. However, the Golden Gate was only constructed in 1037 and the sword is actually dated to the late 12th or 13th century. It was first used as a coronation sword by Władysław I the Elbow-high in 1320. Looted by Prussian troops in 1795, it changed hands several times during the 19th century until it was purchased in 1884 for the Hermitage Museum in Saint Petersburg, Russia. The Soviet Union returned it to Poland in 1928. During World War II, Szczerbiec was evacuated to Canada and did not return to Kraków until 1959. In the 20th century, an image of the sword was adopted as a symbol by Polish nationalist and far-right movements.