Janusz was the son of Ziemowit III von Massow and Eufemie Opavská. The date and place of his birth have not been found.
He died in 1429. The place is not known.
His wife was Danuta Anna of Lithuania, who he married on BEF 27 SEP 1376. The place has not been found. Their three known children were Janusz (<1383-1422), Bolesław III (1385/86-1428) and Konrad (?-?).
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Janusz I von Massow |
Ziemowit III von Massow |
Trojden I von Massow |
Bolesław II Piast |
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Gaudemunda of Lithuania |
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Maria von Halicz |
Yuriy I von Halicz |
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Eufemia Kujawska |
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Eufemie Opavská |
Nikolaus II von Troppau |
Nikolaus I von Troppau |
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Adelheid von Zollern-Nürnberg |
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Anna von Ratibor |
Przemysław I von Ratibor |
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Anna von Massow |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | 1429 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | prince of Warsaw |