Royal kin and queens · Principality of Pomerelia · as at first light, 1 January 1200

Mestwin I

Mestwin, Sambor's younger brother, is about forty, married to Zwinisława, with a daughter and at least two young sons.

No source reached shows him holding a castle district before he succeeds his brother in 1205/1207; the four shares he later gives his sons (Gdańsk; Świecie with Gniew; Lubiszewo; Białogarda) describe his land by 1219/20, not in 1200. One modern account has him helping Mieszko III take Gniezno in 1181, which others give to Bogislaw I of Pomerania. As prince he founds the Premonstratensian nunnery of Żukowo (about 1209), submits to Valdemar II of Denmark in 1210, throws off Danish lordship in 1211, and dies on 1 May 1219 or 1220.

Who he is

Name
Mestwin I (Polish Mściwój I), called 'the Peaceful' (pacificus) in the Oliwa tables
Title
brother of the prince; prince in Gdańsk from 1205/1207 (by about 24 June 1209 he is 'by God's grace prince in Gdańsk')
Since
not pinned (no holding of his own is recorded before he succeeds his brother)
Born
about 1160 (about 39 or 40 years old)
Family
Son of Sobiesław I; de.wikipedia makes his mother a sister of Żyrosław, palatine of Kuyavia (not checked). Wife: Zwinisława (Swinisława, died 1240): ru.wikipedia calls her a daughter of Mieszko III the Old, de.wikipedia 'probably' a daughter of a Polish Duke Mieszko or else of local lesser nobility; older genealogies made her a daughter of Ratibor I of the Słupsk line; marriage date not pinned. Children born by 1 January 1200 (estimates): Mirosława (about 1190; married about 1205 as the second wife of Bogislaw II of Pomerania), Świętopełk (II) (about 1195; ru.wikipedia 'before 1195'), Warcisław (about 1195; ru.wikipedia 'after 1195', so possibly not yet born). Jadwiga (about 1200; later wife of Władysław Odonic) may not yet be born. Later: Witosława (about 1205, prioress of Żukowo), Sambor II (about 1211/12), Racibor (about 1212), Milosława and another daughter, nuns at Żukowo.
Confidence
medium

de.wikipedia, en.wikipedia and ru.wikipedia (Mestwin I); de.wikipedia (Samboriden, Swantopolk II).

Overlord

His brother Sambor I; above him the Polish senior duke in name.

What it holds

  • No holding of his own is recorded for 1200 (not pinned)

How it was acquired

Not applicable for 1200.

Allies and rivals

His brother Sambor. Probably Mieszko III the Old, senior duke at Kraków that morning by the krakow record's reading: if Zwinisława is Mieszko's daughter (ru.wikipedia), Mestwin is his son-in-law, which would fit the story that Mestwin helped Mieszko take Gniezno in 1181. Later the dukes of Pomerania (Bogislaw II, his son-in-law from about 1205).

How things stand that morning

Alive, at or near his brother's court so far as known; his share is not pinned.

Threats

  • Exclusion from the succession if Sambor's young sons outlive their father (they do not)

What the year holds

What happened next, if nothing in play changes it. Each event carries what it depends on and what would stop it.

  1. 1205/1207 (after this year)Succeeds Sambor at Gdańsk and becomes guardian of Sambor's young sons.Depends on: Sambor's death (7 February 1207 per the Oliwa necrology) Stopped by: Mestwin dying first
  2. About 24 June 1209 (after this year)As prince in Gdańsk founds the Premonstratensian nunnery of Żukowo, with villages between the Radunia and the Słupia; his wife Zwinisława adds land of her own, the Oksywie upland among it.Depends on: his succession
  3. 1210-1211 (after this year)Swears fealty to Valdemar II of Denmark at Gdańsk; free again in 1211.Depends on: the Danish expedition

Where the sources disagree

  • en.wikipedia (Casimir II) has Mestwin help Mieszko III take Gniezno in 1181 'while ruling Pomerelia'; en.wikipedia (Mieszko III) gives that help to Bogislaw I of Pomerania.
  • His wife's origin: a daughter of Mieszko III the Old (ru.wikipedia), of a Duke Mieszko or local nobility (de.wikipedia), or of Ratibor I (older view, en.wikipedia). The Greater Poland record (wlk) does not list her among Mieszko III's children.

Evidence: Well attested as prince after 1207; his position before is not shown by any source reached.

On the map: Not drawn: his share in 1200 is not pinned. The seat marks his brother's court.

Primary sources for Pomerelia

Chronicles, registers, sagas and inscriptions written in or near 1200 that cover this entry. Each has its own page with editions, translations and where to read it.

Sources and studies

  1. Wikipedia: Mestwin I, Duke of Pomerania
  2. Wikipedia (de): Mestwin I.
  3. Wikipedia (ru): Mestwin I
  4. Wikipedia (de): Samboriden
  5. Wikipedia (de): Swantopolk II.
  6. Wikipedia: Casimir II the Just
  7. Wikipedia: Mieszko III the Old
  8. Wikipedia (de): Pommerellen

Last revised 4 November 2026. Published 4 November 2026. Suggest a correction on the OMNIA Discord.