BOLESLAV of Bohemia, son of VRATISLAV I Duke of the Bohemians & his wife Drahomira ze Stodor ([908/10]-15 Jul [967]). The Chronica Boemorum names "Wincezlaum…et Bolezlaum" sons of Wratislav and Dragomir[27]. His birth date range is estimated from the birth date of his second son and the estimated birth date of Boleslav's older brother. "Bolezlav" is named as younger brother of "Vencezlaum" in the Vita Vencezslavi, which specifies that he was "mentis perversitate et actuum qualitate execrandus, diabolico tactu instinctus"[28]. He succeeded in 935, after murdering his brother, as BOLESLAV I "der Grausame" Duke of the Bohemians. His accession marked the start of a period of hostile relations with the empire until Otto I King of Germany forced Duke Boleslav to pay tribute fourteen years later, and placed him, according to Thietmar, "in the custody of his brother Heinrich Duke of Bavaria"[29]. The Bohemians helped King Otto defeat the Hungarians at Lechfeld near Augsburg in 955, and afterwards crossed the Carpathians and occupied Krakow and Silesia[30]. In 965, Duke Boleslav formed an alliance with Mieszko I Prince of Poland, confirmed by the marriage of the latter to Boleslav's daughter[31]. Duke Boleslav supported the rebellion of Heinrich II "der Zänker" Duke of Bavaria against his cousin Otto II King of Germany in [974/75]. After the latter confiscated the duke's territories, ex-Duke Heinrich fled to Bohemia and took refuge with Duke Boleslav[32]. The Chronica Boemorum records the death of Bolezlaus "967 Id Iul"[33]. The Cronica Principum Regni Boemiæ records the death in 967 of "Boleslaus Sacuus filius Wratislai"[34].
m BIAGOTA, daughter of ---. The Chronica Boemorum names "Ztrahquaz" as wife of Bolezlas[35].
Duke Boleslav I & his wife had four children