Sibylle of Brandenburg was a Princess of Brandenburg by birth and by marriage Duchess of Jülich and Duchess of Berg.
Background
Sibylle was a daughter of Elector Albrecht III Achilles of Brandenburg (1414–1486) from his second marriage to Anna (1436–1512), daughter of the Elector Frederick II of Saxony.
Career
The wedding celebration was very expensive. In addition to numerous archbishops, bishops and prelates, the Archduke of Austria, the Duke of Burgundy, the Elector of Brandenburg and the Margrave of Baden, more than 50 counts and countless were invited and countless other noblemen. Because of the large number of guests, the marriage was concluded in an open field in front of Saint Severin gate.
The priest was Archbishop Herman of Cologne.
Sibylle was supposed to bring a large dowry into the marriage, but William had to write his in-laws several times about delays in its payment. They were engaged in 1496, when Maria was five years old and John was six.
This resulted in the so-called Cleves Union in which the Duchies of Jülich-Berg-Ravensberg and Cleves-Mark were combined to form the United Duchies of Jülich-Cleves-Berg. When William died in 1511, Maria, being female, could not inherit and Jülich-Berg-Ravensberg fell to John III. At the request of Maria and John II, who resided in Cleves, she acted as governor of Jülich-Berg during this period.
Sybille was described as spirited, energetic and wise and an equitable mother for her country.
Sibylle died in 1524 and was buried in Altenberg Abbey. Maria (1491–1543), married in 1510 Duke John III of Cleves (1490–1536), who became Duke John I of Jülich-Cleves-Berge.
