Walburga of Egmont Dutch countess (1489-1529) (1489–1529) Parents Magdalena of Werdenberg-Trochtelfingen John III of Egmont Children Magdalene of Nassau-Siegen Elisabeth of Nassau-Siegen Siblings Johanna van Egmond George van Egmond John IV of Egmont Josine van Egmont Allert Groot bastaard van Egmond Partners William I, Count of Nassau-Siegen