Irmgard of Guelders Peerage person ID=575501 (b. 1185) Parents Richardis of Bavaria Otto I, Count of Guelders Children Adelheid von der Mark Mechtilde von der Mark Otto van der Mark Gerard von der Mark Richarde von der Mark Engelbert I, Count of the Mark Siblings Hendrik van Gelre Matilda of Guelders Gerard III, Count of Guelders Margaret of Guelders Otto I Adelaide of Guelders Maria van Gelre Partners Adolphus I, Count of the Mark