Boleslav I Duke of Bohemia the Cruel

✓ Boleslav I 'the Cruel', Duke of the Bohemians 935-[967] ([908/10]-15 Jul [967]), son of Vratislav I by Drahomira (Chronica Boemorum: 'Wincezlaum...et Bolezlaum' sons of Wratislav and Dragomir; Vita Vencezslavi); murdered his brother St Wenceslas (Wenzel I) 935 and succeeded; submitted to Otto I; fought at the Lechfeld 955; allied with Mieszko I of Poland 965, 'confirmed by the marriage of the latter to Boleslav's daughter'; father of Boleslav II, Strahkvas and Dobrawa. CROWN: Duke of Bohemia. Source: Medieval Lands (fmg.ac, Cawley), read 5 Nov 2026: 'Bohemia' (Premyslid dukes). [DIRECT ANCESTOR OF THE COMPILER: flag added 2 Nov 2026 by walking the tree from Aynsley, so that this marker is reliable and can be searched.]