Otto I, Count of Guelders Count of Guelders and participant in the Third Crusade (1150–1207) Parents Agnes von Arnstein Henry I, Count of Guelders Children Adelaide of Guelders Hendrik van Gelre Matilda of Guelders Irmgard of Guelders Margaret of Guelders Gerard III, Count of Guelders Maria van Gelre Otto I Siblings Gerard of Guelders Margaret of Guelders Adelheid van Gelre Agnes van Gelre Partners Richardis of Bavaria