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Siemomysł or Ziemomysł (died ) was the third duke of Polans of the
Piast The House of Piast was the first historical ruling dynasty of Poland. The first documented Polish monarch was Duke Mieszko I (c. 930–992). The Piasts' royal rule in Poland ended in 1370 with the death of king Casimir III the Great. Branc ...
dynasty, and the father of
Poland Poland, officially the Republic of Poland, is a country in Central Europe. It is divided into 16 administrative provinces called voivodeships, covering an area of . Poland has a population of over 38 million and is the fifth-most populou ...
's first Christian ruler,
Mieszko I Mieszko I (; – 25 May 992) was the first ruler of Poland and the founder of the first independent Polish state, the Duchy of Poland. His reign stretched from 960 to his death and he was a member of the Piast dynasty, a son of Siemomysł and ...
. He was listed by Gallus Anonymous in his ''
Gesta principum Polonorum The ''Gesta principum Polonorum'' (; "''Deeds of the Princes of the Poles''") is the oldest known medieval chronicle documenting the history of Poland from the legendary times until 1113. Written in Latin by an anonymous author, it was most lik ...
'' and was the son of
Lestek Lestek (also Leszek, Lestko) was the second duke of Polans, and son of Siemowit, born c. 870–880, mentioned in the oldest Polish chronicle, ''Gesta principum Polonorum'' by Gallus Anonimus. The dukes of Polans were the foundation of the Piast ...
, the second known Duke of the Polans. According to Gallus' account and historical research, Siemomysł has been credited with leaving the lands of the Polans,
Goplans The Goplans or Goplanes ( la, Glopeani, pl, Goplanie) was an early West Slavic tribe that inhabited the central parts of the Kujawy region, with their probable seat at Kruszwica. They might have been named after the Lake Gopło; Kmietowicz believ ...
and
Masovians Masovians, also spelled as Mazovians, and historically known as Masurians, is an ethnographic group of Polish people that originate from the region of Masovia, located mostly within borders of the Masovian Voivodeship, Poland. They speak the Masov ...
to his son
Mieszko I Mieszko I (; – 25 May 992) was the first ruler of Poland and the founder of the first independent Polish state, the Duchy of Poland. His reign stretched from 960 to his death and he was a member of the Piast dynasty, a son of Siemomysł and ...
, who further expanded them during his reign. According to modern Polish historian
Henryk Łowmiański Henryk Łowmiański (August 22, 1898 near Ukmergė - September 4, 1984 in Poznań) was a Polish historian and academic who was an authority on the early history of the Slavic and Baltic people. A researcher of the ancient history of Poland, Lithu ...
, Siemomysł aided the
Ukrani 250px, ''Burgwallinsel'', a former Ukrian Oberuckersee.html"_;"title="burgh_on_an_isle_in_Lake_Oberuckersee">burgh_on_an_isle_in_Lake_Oberuckersee_ The_Ukrani_or_UkriansOberuckersee.html"_;"title="burgh_on_an_isle_in_Lake_Oberuckersee">burgh_o ...
uprising against the Germans in 954 AD. He supposedly reigned from around 930 (although some historians believe that he reigned from around 950). Siemomysł united the lands of Polanie, Goplanie, and Mazowszanie (however, some historians think that perhaps his father did it first). His burial place is unknown. Siemomysł's wife (or wives) is unknown. There is a theory that the daughter of Włodzisław, prince of the Lędzianie tribe, could have been Siemomysł's wife, but there is no historical evidence to support this. Formerly it was thought that his wife was named Gorka, but
Oswald Balzer Oswald Marian Balzer (23 January 1858 in Chodorów – 11 January 1933 in Lwów) was a Polish historian of law and statehood, one of the most renowned Polish historians of his times. In 1887 he became a professor at the University of Lwów. B ...
refuted this view in 1895.
Mieszko I Mieszko I (; – 25 May 992) was the first ruler of Poland and the founder of the first independent Polish state, the Duchy of Poland. His reign stretched from 960 to his death and he was a member of the Piast dynasty, a son of Siemomysł and ...
and
Czcibor Czcibor ( la, Cidebur; died after 972), a member of the Piast dynasty, was a Polan prince, son of Duke Siemomysł and younger brother of the first Christian ruler, Mieszko I of Poland. Life According to E. Rymar (2005), Czcibor may have been ...
were his sons.


See also

*
Poland in the Early Middle Ages The most important phenomenon that took place within the lands of Poland in the Early Middle Ages, as well as other parts of Central Europe was the arrival and permanent settlement of the West Slavic or Lechitic peoples. The Slavic migrations ...


References

{{DEFAULTSORT:Siemomysl 10th-century Polish monarchs Piast dynasty Slavic pagans 10th-century deaths Year of birth uncertain Year of death uncertain