John I Albert was King of Poland from 1492 to his death and Duke of Głogów from 1491 to 1498. He was the fourth Polish sovereign from the Jagiellonian dynasty and the son of Casimir IV and Elizabeth of Austria.
John Albert's tomb effigy at Wawel Cathedral
Casimir IV and Elizabeth Habsburg with their thirteen children, 1506. John Albert is placed between brothers Alexander and Vladislaus.
John on an excerpt from Chronica Polonorum, 1519
Konrad III Rudy, Duke of Masovia and John Albert's adversary
The Duchy of Głogów or Duchy of Glogau was one of the Duchies of Silesia ruled by the Silesian Piasts. Its capital was Głogów in Lower Silesia.
Silesia 1249-1273: Creation of the Duchy of Głogów (green) for Konrad I from the territory of Bolesław II the Bald of Legnica (violet)
Głogów Castle (initially wooden gord; brick walls were built after 1291)