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Siemowit IV died on 21 January 1426 leaving his domains to his four sons: Siemowit V, Casimir II, Trojden II (d. 1427) and Władysław I (a fifth son, Alexander, followed a Church career). Not wanting to further weakened their positions and domains with subsequents divisions, they decided to co-rule all their paternal inheritance.
Siemowit IV died on 21 January 1426 leaving his domains to his four sons: Siemowit V, Casimir II, Trojden II (d. 1427) and Władysław I (a fifth son, Alexander, followed a Church career). Not wanting to further weakened their positions and domains with subsequents divisions, they decided to co-rule all their paternal inheritance.
Siemowit IV died on 21 January 1426 leaving his domains to his four sons: Siemowit V, Casimir II, Trojden II (d. 1427) and Władysław I (a fifth son, Alexander, followed a Church career). Not wanting to further weakened their positions and domains with subsequents divisions, they decided to co-rule all their paternal inheritance.
May 3, 2024 · When his brother Casimir died unexpectedly in 1355, Casimir III the Great left the Duchy of Warsaw to Siemowit. In exchange, he promised never to ally with enemies of Poland and the Duchy of Płock would return to Poland, unless Casimir III died without an heir.
According to a 12th-century legend, when Prince Popiel of Gnesen (now Gniezno) died, in the second half of the 9th century, he was succeeded by Siemowit, the son of the prince’s plowman, Piast, thus founding a dynasty that ruled the Polish lands until 1370. (The name Piast was not applied to the dynasty until the 17th century.)
- The Editors of Encyclopaedia Britannica
When his brother Casimir died unexpectedly in 1355, Casimir III the Great left the Duchy of Warsaw to Siemowit. In exchange, he promised never to ally with enemies of Poland and the Duchy of Płock would return to Poland, unless Casimir III died without an heir.
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Jun 17, 2021 · In July 1434 Casimir II and Siemowit V arrived in Kraków, where they attended the coronation of the new Polish King, Władysław III. On 31 August 1434 the sons of Siemowit IV finally decided to end their co-rulership and made the formal territorial division.
