The Hussars (husaria) were either light or heavy cavalry units, particularly prominent in the Polish-Lithuanian Commonwealth between the 16th and 18th centuries. Stemming from medieval light cavalry (like the Serbian Husars), they were first adapted in Poland in a similar form and later transformed into a heavier formation by king Stefan Batory to work more along the lines of Hungarian tradition. Being such an elite unit, the Hussars often wore elaborate decorations over their heavy armor, the most memetic (but historically debatable) being feathered wings who were attached to the saddle or back. Distinguished in many battles (including the Battle of Vienna of 1683), the Hussars rarely suffered defeat, the only significant one being during the Khmelnytsky Uprising in 1648.