Our magnet features the Polish Winged Hussar in an outline of Poland and the word "Polska" in the upper left.  See below for the history of these Polish knights.
The Polish Hussars (Polish: Husaria) were the main type of cavalry of the first Polish Army, later also introduced into the Army of the Grand Duchy of Lithuania, between the 16th and 18th centuries. When this cavalry type was first introduced by the Serbian mercenary horsemen around the year 1500, they served as light cavalry banners; by the second half of the 16th century hussars had been transformed into heavy cavalry. Until the reforms of 1770s the husaria banners or companies were considered the elite of the Polish-Lithuanian Commonwealth cavalry. They were widely regarded as one of the most powerful cavalry formations in the world. Polish Hussars were undefeated in battle for over 100 years.
Source: http://en.wikipedia.org/wiki/Polish_hussars