Sybille of Cleves
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Sybille of Cleves (properly Sibylle von Jülich-Kleve-Berg) (January 17, 1512, Düsseldorf—February 21, 1554, Weimar) was the eldest daughter of John III, Duke of Cleves and a sister of Anne of Cleves. Sybille's mother was named either Jülich Kleve or Maria von Jülich (1491-1543). In September, 1526 Sybille married John Frederick I, Elector of Saxony.
This article incorporates text translated from the corresponding German Wikipedia article as of 4 December 2006.