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Ziemomsyl I PIAST, King of Poland

Ziemomsyl I PIAST, King of Poland

Male Abt 892 - 964  (~ 72 years)

Personal Information    |    Notes    |    Sources    |    All    |    PDF

  • Name Ziemomsyl I PIAST  [1
    Suffix King of Poland 
    Born Abt 892  Poznan, Wielkopolskie, Poland Find all individuals with events at this location  [1
    Gender Male 
    Clan   [2
    House of Piast 
    FamilySearch ID LHY9-RBR 
    TitleOfNobility   [2
    3rd Duke of the Polans 
    Religion   [2
    Slavic paganism 
    Died 25 May 964  Poznan, Wielkopolskie, Poland Find all individuals with events at this location  [1
    Person ID I594764498  Carney Wehofer 2024 Genealogy
    Last Modified 9 Dec 2022 

    Father Leszek IV PIAST, Prince of Poland,   b. Abt 870, Poznan, Wielkopolskie, Poland Find all individuals with events at this location,   d. 950  (Age ~ 80 years) 
    Mother Princess Unconfirmed, of Poland,   b. 869, Poznan, Wielkopolskie, Poland Find all individuals with events at this location,   d. 920, Poznan, Wielkopolskie, Poland Find all individuals with events at this location  (Age 51 years) 
    Family ID F536728280  Group Sheet  |  Family Chart

    Children 
     1. Herbastus DE CREPON, King Of Denmark,   b. Abt 911, Arque, Seine-Inferieure, Normandy, France Find all individuals with events at this location,   d. 20 Nov 996, Dourdan, Essonne, Ile-de-France, France Find all individuals with events at this location  (Age ~ 85 years)
     2. Adelajda, The White - Princess of Poland,   b. Abt 940, Poznan, Poznan, Poland Find all individuals with events at this location,   d. 997, Hungary Find all individuals with events at this location  (Age ~ 57 years)
    Last Modified 9 Dec 2022 
    Family ID F536728279  Group Sheet  |  Family Chart

    Family 2 Wlodzislawa VON LEDZIANIE,   d. Yes, date unknown 
    Last Modified 9 Dec 2022 
    Family ID F536728282  Group Sheet  |  Family Chart

    Family 3 Gorka VON POLEN, Duchess of Poland,   b. 896, Poznan, Wielkopolskie, Poland Find all individuals with events at this location,   d. 962, Poznan, Wielkopolskie, Poland Find all individuals with events at this location  (Age 66 years) 
    Married 911  Poznan, Poznan, Poland Find all individuals with events at this location  [2
    Children 
     1. Chosciszko, Prince of POLAND,   b. Abt 925, Of, Poznan, Poznan, Poland Find all individuals with events at this location,   d. Between 6 Jan 963 and 5 Jan 964  (Age ~ 38 years)
     2. Czcibor ZIEMOMYSLICH,   b. Abt 928, Of, Poznan, Poznan, Poland Find all individuals with events at this location,   d. Aft 24 Jun 972, Poland Find all individuals with events at this location  (Age ~ 44 years)
     3. Mieszko I PIAST, Duke of Poland,   b. Abt 930, Poznan, Wielkopolskie, Poland Find all individuals with events at this location,   d. 25 May 992, Poznan, Wielkopolskie, Poland Find all individuals with events at this location  (Age ~ 62 years)
     4. Prokuj PRINCE OF POLAND,   b. Abt 933, Of Poznan, Miasto Poznan, Poznan, Poland Find all individuals with events at this location,   d. 994  (Age ~ 61 years)
     5. Princess Adelajda Aleta PIAST OF POLAND,   b. Abt 953, Poznan, Wielkopolskie, Poland Find all individuals with events at this location,   d. 997, Sz?kesfeh?rv?r, Fej?r, Hungary Find all individuals with events at this location  (Age ~ 44 years)
    Last Modified 9 Dec 2022 
    Family ID F536728281  Group Sheet  |  Family Chart

  • Notes 
    • Siemomysl or Ziemomysl (died c. 950? 960) was the third duke of Polans of the Piast dynasty, and the father of Poland's first Christian ruler, Mieszko I. He was listed by Gallus Anonymous in his Gesta principum Polonorum and was the son of Lestek, the second known Duke of the Polans. According to Gallus' account and historical research, Siemomysl has been credited with leaving the lands of the Polans, Goplans and Masovians to his son Mieszko I, who further expanded them during his reign.

      According to modern Polish historian Henryk Lowmianski, Siemomysl aided the Ukrani uprising against the Germans in 954 AD.

      He supposedly reigned from around 930 (although some historians believe that he reigned from around 950). Siemomysl united the lands of Polanie, Goplanie, and Mazowszanie (however, some historians think that perhaps his father did it first). His burial place is unknown.

      Siemomysl's wife (or wives) is unknown. There is a theory that the daughter of Wlodzislaw, prince of the Ledzianie tribe, could have been Siemomysl's wife, but there is no historical evidence to support this. Formerly it was thought that his wife was named Gorka, but Oswald Balzer refuted this view in 1895. Mieszko I and Czcibor were his sons.



  • Sources 
    1. [S1160] FamilySearch Family Tree (http://www.familysearch.org), The Church of Jesus Christ of Latter-day Saints, ((http://www.familysearch.org)), accessed 9 Dec 2022), entry for Herbastus DE CREPON, person ID G8ST-XJY. (Reliability: 3).

    2. [S1160] FamilySearch Family Tree (http://www.familysearch.org), The Church of Jesus Christ of Latter-day Saints, ((http://www.familysearch.org)), accessed 9 Dec 2022), entry for Ziemomsyl I Piast, person ID LHY9-RBR. (Reliability: 3).