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In page Vratislaus I, Duke of Bohemia:
"He was a son of Duke Bořivoj I of Bohemia by his wife Ludmila and the younger brother of Duke Spytihněv I. Around 906, he married Drahomíra, a Hevellian princess, to establish close ties with the Polabian Slavs. Vratislaus had at least two sons, Wenceslaus and Boleslaus, both of whom succeeded him as Bohemian dukes. Some historians believe that Střezislava, the wife of the Bohemian nobleman Slavník, founder of the Slavník dynasty, was also the daughter of Vratislaus.[1]
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