illegitimate daughter of Vladimir of Kiev

http://fmg.ac/Projects/MedLands/RUSSIA,%20Rurik.htm#VladimirovnaMBe...

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• 15. [--- Vladimirovna . Baumgarten states that the wife of Markgraf Bernhard was the illegitimate daughter of Grand Prince Vladimir Sviatoslavich. He cites a single German secondary source, dated to 1722, but this in fact makes no mention of Bernhard´s wife[142]. The authority for his statement is therefore unknown and it is preferable to assume that it is incorrect until further information comes to light. m ([991/92]%29 as his second wife, BERNHARD [von Haldensleben], son of DIETRICH Markgraf über den Gau der Heveller [Nordmark] & his wife --- (-[1044/51]). He was installed in 1009 as BERNHARD Markgraf der Nordmark.]

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The primary source which confirms her existence as a daughter of Vladimir I of Kiev has not yet been identified.