John of Bohemia

John of Bohemia, also called the Blind or of Luxembourg (Luxembourgish: Jang de Blannen; German: Johann der Blinde; Czech: Jan Lucemburský; 10 August 1296 – 26 August 1346), was the King of Bohemia and titular King of Poland from 1310, and Count of Luxembourg from 1313. He is well known for having died while fighting in the Battle of Crécy at age 50, after having been blind for a decade. In his home country of Luxembourg, he is considered a national hero. Comparatively, in the Czech Republic (anciently the Kingdom of Bohemia), Jan Lucemburský is often recognized for his role as the father of Charles IV, Holy Roman Emperor, one of the more significant Kings of Bohemia and one of the leading Holy Roman Emperors.

Source: Wikipedia — https://en.wikipedia.org/wiki/John_of_Bohemia