House of Jülich

By marriage they acquired the duchy of Gelders, which eventually passed to the House of Egmond.

The members of the House were counts of Jülich, until Wiliam V supported Emperor Charles IV, who in turn rewarded William V by elevating him as duke of Jülich.

Both his sons died childless, so the duchy of Guelders passed to Johanna's grandson Arnold of the House of Egmond.

Thus Gerhard VI became jure auxoris count of Berg and Ravensberg.

His son William IV was duke of Jülich-Berg, but had no sons, thus succeeded by his daughter Maria with her husband John III duke of Cleves, of the House of La Mark.

Coat-of-arm of Jülich .
Coat-of-arm of Guelders (gold lion) and Jülich (black lion).
Coat-of-arm of Jülich (black lion), Berg (red lion) and Ravensberg (above all, three red chevrons).