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 countesses were invited and countless other noblemen.

Because of the large number of guests, the marriage was concluded in an open field in front of St. Severin gate.

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.

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.