Adelaide of Guelders Countess consort of Holland (1182–1218) Parents Richardis of Bavaria Otto I, Count of Guelders Children Otto III van Holland Ada of Holland Floris IV, Count of Holland Siblings Hendrik van Gelre Matilda of Guelders Gerard III, Count of Guelders Irmgard of Guelders Maria van Gelre Margaret of Guelders Otto I Partners William I, Count of Holland