United Duchies of Jülich-Cleves-Berg
She married Duke John III of Cleves. They were engaged in 1496, when Maria was five years old and John was six. In her marriage to John III, Duke of Cleves in 1509, Maria's estates and titles were eventually to be merged with the Duchy of Cleves. 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.