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Siemowit VI of Płock (pl: Siemowit VI płocki; 2 January 1446 - 31 December 1461/1 January 1462), was a Polish prince member of the House of Piast from the Masovian branch. He was a Duke of Płock , Rawa Mazowiecka , Belz , Płońsk , Zawkrze and Wizna during 1455-1461/62 (under regency until 1459) jointly with his brother, since 1459 ruler ...
Ziemowit VI / Siemowit VI: Son of Wladyslaw I. Gained Płock (1455). c.1462: Barbara Ruska: Regent of Czersk. c.1462: Paul of Gizycko: Regent and bishop of Płock and of Czersk. 1462: Belz, Gostynin, and Rawa are annexed by Poland while Płock, Plonsk, Wizna and Zawkrze go to the duchy of Warsaw. 1471 - 1488: Bolesław V: Son of Bolesław IV. 1488
Life. After the death of their father on 11/12 December 1455, Władysław II and his brother Siemowit VI inherited their domains; however, because at that moment they are minors, the regency was held by their mother and Paweł Giżycki, Bishop of Płock.
Siemowit VI (2 January 1446 - 31 December 1461/1 January 1462). Władysław II (aft. 31 October 1448 - 27 February 1462). Because his sons are minors at the time of his death, the regency was taken by their mother and Paweł Giżycki, Bishop of Płock.
Date of birth: 2 January 1446, 11 January 1446: Date of death: 1 January 1462, 10 January 1462: Manner of death
2 Jan 1446. Death. 31 Dec 1461 (aged 15) Burial. Plock Cathedral. Płock, .
Siemowit VI and Władysław II were dukes of Płock, Wizna, Zawkrze, Sochaczew, Gostyń, and Bełz. Various claimants to their duchies emerged, among whom Catherine, daughter of Siemowit IV and widow of Mykolas Žygimantaitis, and Margaret, duchess of Oleśnica, pursued their claims energetically.