Margaret Sambiria

Margaret Sambiria, in Danish: Margrethe Sambiria or Sambirsdatter, (1230?–1282) was the Queen consort of Christopher I of Denmark, and acted as regent for Eric V of Denmark. In Danish she is also known as queen Margrethe Sprænghest.

She was born around 1230 to duke Sambor II of the ruling Samborides family of Slavic (Wendish) Cassubians and his wife, Matilda of Mecklenburg. They held a lordship (then treated as duchy or principality) of Pomerelia.

Her paternal grandparents were Mestwin I (Mściwój) of Pomerelia and his wife Swinislawa. Yet more interesting from Danish viewpoint were Margaret's maternal grandparents, who were Henry Borwin II, Lord of Mecklenburg, and his wife Lady Kristina from Scania, who according to newest research was a daughter of the mighty Danish Galen clan, magnates in Eastern Denmark, and related to the Hvide clan of Zealand.

Margaret received her first name, then yet relatively rare in North Germany and Poland (Margaret is actually a Greek name) in honor of her maternal Scandinavian relations (where the name Margaret came in the late 11th century with the family of Inge I of Sweden), presumably of her aunt (countess of Schwerin) and great-aunt (princess of Rugia).

She was, in 1248, married to prince Christopher, the youngest son of Valdemar II of Denmark and Berengária of Portugal. Her husband ascended the throne of Denmark in 1252 as Christopher I of Denmark by the then succession custom which followed so called agnatic seniority and Margaret was crowned together with him.

...
Wikipedia