Henry, Margrave of Frisia German nobleman (1055–1101) Parents Richenza of Swabia Otto of Nordheim Children Gertrude of Northeim Richenza of Northeim Otto III of Northeim Siblings Ethelinde of Northeim Kuno, Count of Beichlingen Siegfried III, Count of Boyneburg Mathilde von Northeim Oda von Werl Ida von Nordheim Partners Gertrude of Brunswick