Tags: Noble.
Sibylle of Jülich-Cleves-Berg Margravine of Burgau (26 August 1557 in Cleves – 1628 in Günzburg) was the daughter of Duke William the Rich and his second wife Archduchess Maria of Austria.Her brother John William inherited the United Duchies of Jülich-Cleves-Berg in 1592. After he had developed a mental illness a power struggle broke out at court between Sibylle and her sister-in-law Jakobea of Baden. Sibylle won and imprisoned Jakobea.
