John the Blind of Luxemburg (August 10, 1296 - August 26, 1346) was King of Bohemia and Count of Luxemburg. He was the eldest son of the Holy Roman Emperor Henry VII of Luxemburg and his wife Margaret of Brabant.
In 1310 John married Elizabeth of Bohemia and thereby became king of Bohemia. He retained his crown even after her death in 1330. He then married Beatrix, daughter of Louis I, Duke of Bourbon.
He was killed fighting (though blind!) alongside the French against the English at the Battle of Crecy, and was succeeded as king of Bohemia by his eldest son Charles I (later Charles IV, Holy Roman Emperor).
His children by Elizabeth of Bohemia were:
Margaret, (1313-1341), who married Henry Duke of Upper Bavaria
John Hus was born in 1373 in the southern part of Bohemia (now Czechoslovakia) in the village of Husinec -- hence his surname, Hus.
In 1402 John was appointed rector and preacher at the Chapel of the Holy Infants of Bethlehem in Prague.
John Hus had become thoroughly familiar with the teachings of Wycliffe and, convinced of their truth, he had himself begun to teach them in the university and preach them in the pulpit.