Christina of Holstein-Gottorp was Queen of Sweden as the second wife of King Charles IX. She served as regent in 1605, during the absence of her spouse, and in 1611, during the minority of her son, King Gustav II Adolph.

Gunilla Bielke; Swedish: Gunilla Johansdotter Bielke af Åkerö was Queen of Sweden as the second wife of King John III. Queen Gunilla is acknowledged to have acted as the political adviser to John III and to have influenced his religious policies in favour of Protestantism.