She married on 8 February 1540 in Dresden Duke Francis I of Saxe-Lauenburg (1510–1581). This relationship turned out to be important for Sibylle's brother Maurice during the Schmalkaldic War. The marriage proved unhappy and Francis accused Sibylle of vindictive and unloving acts.[1] In later years, Sibylle and Francis reconciled again. In 1552, Sibylle asked her brother Maurice to financially assist her husband, so he could redeem some goods and villages from Lübeck.[2]
In 1588, the Duchess played a prominent role in the affair of her son Maurice, who lived in Buxtehude in the Altkloster[nds] Abbot's House since 1585/86, with Adam von Tschammer's wife Gisela against whom she initiated a trial of witchcraft.
Sibylle died in 1592 in Buxtehude and was buried in the Cathedral of Ratzeburg.
Children
From her marriage to Francis, Sibylle had the following children:
Henry (*1 November 1550 – 22 April 1585*, Vörde), as Henry III Prince-Archbishop of Bremen (1567–1585), as well as Prince-Bishop of Osnabrück (Henry II, 1574–1585) and Paderborn (Henry I, 1577–1585), married Anna von Broich
Maurice (*1551 – 1612*), married in 1581 Katharina von Spörck, divorced in 1582
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