Richenza of Swabia Countess of Werl by marriage and later Countess of Northeim and Duchess of Bavaria (b. 1025) Parents Otto II, Duke of Swabia Children Siegfried III, Count of Boyneburg Oda von Werl Henry, Margrave of Frisia Ethelinde of Northeim Mathilde von Northeim Kuno, Count of Beichlingen Ida von Nordheim Siblings Hildegard von Egisheim Partners Herman III van Werl Otto of Nordheim