Who married Siemowit I of Masovia?
Pereiaslawa of Galicia married Siemowit I of Masovia in .
Siemowit I of Masovia
Siemowit I of Masovia (Polish: Siemowit (Ziemowit) I mazowiecki) (d. 23 June 1262), was a Polish prince member of the House of Piast, Duke of Czersk during 1247–1248, Duke of Masovia (except Dobrzyń) during 1248–1262, ruler over Sieradz during 1259–1260.
He was the sixth son of Konrad I of Masovia and his wife Agafia of Rus.
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Pereiaslawa of Galicia
Переяслава Даниловна (польск. Perejesławą; ум. 12 апреля 1283) — княжна из рода Рюриковичей, в браке княгиня-консорт Черска и Мазовии.
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