Born in 1296 - Crécy-en-Ponthieu, Died in 1346.)
Son of the Roman Emperor Henry VII and King of Bohemia in 1310 by his marriage to Elisabeth, sister of Wenceslas of Bohemia, he had an eventful life.
Barely crowned, he leaves the government of his kingdom to his wife and runs on all the battlefields of Europe. We find him contributing to the victory of Louis V of Bavaria at Mühldorf in 1322, then alongside the King of France against the Flemings in 1328. The following year, he came to the aid of the Teutonic Knights. In 1331, vicar of Louis V in Italy, he seized Cremona, Parma, Pavia, Modena. Shortly after, John XXII manages to divert him from the emperor by offering him the crown of Italy. Then Louis V raises Bohemia against him. But John quickly recovers his authority and even expands his states in Lusatia and Moravia. A great friend of the Valois, he often resided in France where in 1332 he married his daughter, Bonne, to Prince Jean, the future Jean II. By this alliance, he is the grandfather of Charles V. Affected by blindness in 1339, he had his son Charles elected to the empire in 1346, and did not let his infirmity stop him from launching himself against the English in Crécy where he finds a glorious death, having had his horse tied by the brake to those of his house. His companions, reports Froissart, "were found the next day in the square around their lord, and their horses bound together".
Jean is one of the most representative characters of chivalrous Europe at the time of the first Valois.