http://en.wikipedia.org/wiki/St%C5%99ezislava
Střezislava (died 987) was the wife of Slavník, a Bohemian nobleman and founder of Slavník dynasty. Some historians suppose that she might have been a member of the Přemyslid house (the ruling family in Bohemia at that time), possibly a daughter of Vratislaus I or of some historically unknown member of that dynasty.
Střezislava had several children with her husband, 6 of her sons are known by name:
Soběslav (d. 1004)
Saint Adalbert (Vojtěch)
Spytimír
Pobraslav
Porej
Čáslav