Bolesław was born in 1385/86, the son of Janusz I von Massow and Danuta Anna of Lithuania. The place is not known.
He died in 1428. The place is not known.
His wife was Anna Ivanovna Holczanska, who he married in BEF 1413. The place has not been found. Their three known children were Konrad (1413-1427), Bolesław IV (<1421-1454) and Eufemia (<1420-c1436).
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Bolesław III von Massow |
Janusz I von Massow |
Ziemowit III von Massow |
Trojden I von Massow |
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Maria von Halicz |
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Eufemie Opavská |
Nikolaus II von Troppau |
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Anna von Ratibor |
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Danuta Anna of Lithuania |
Kęstutis |
Gédyminas |
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Olga Vsevolodovna Smolenskaya |
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Birutė |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Birth | 1385/86 |
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| Death | 1428 |
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