William the Victorious, Duke of Brunswick-Lüneburg

William I KG, called the Victorious, a member of the House of Welf, was Duke of Brunswick-Lüneburg. He was reigning Prince of Lüneburg from 1416 to 1428 and of Brunswick-Wolfenbüttel from 1428 to 1432, counted either as William III or William IV. From 1432, he ruled over the newly established Principality of Calenberg, from 1463 also over the Principality of Göttingen. In 1473, he stepped down in favour of his sons, to assume the rule in Brunswick-Wolfenbüttel.