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Gerard II was Count of Guelders from March 1129, following his father's death, until his own death on October 24, 1131.
Gerard married Ermgard of Zutphen, daughter of Otto II, Count of Zutphen and Judith of Arnstein. They had two children:
- Henry I, Count of Guelders married Agnes of Arnstein, daughter of count Louis III of Arnstein.
- Salome of Guelders, married Henry I, Count of Wildeshausen.
- ^ Lindeborn, J. (1670) Historia sive notitia episcopatus Daventriensis (Metelen), p. 535.