Family History Research in Spain
| Name | Siemowit IV of Masovia | |
| Gender | Male | |
| Person ID | I977 | Trastámara Genealogy |
| Last Modified | 9 May 2025 | |
| Family | Alexandra of Lithuania, b. Abt. 1370 d. 20 Apr 1434, Plock, Mazowieckie, Poland  (Age ~ 64 years) | |||
| Children |
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| Family ID | F363 | Group Sheet | Family Chart | ||
| Last Modified | 9 May 2025 | |||
| Photos | | Siemowit IV of Masovia |
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