Emilie d'Orange-Nassau, princesa de Portugal House of Aviz-Beja. EMILIA Princess of Orange, known as Emilia of Nassau, as Emilia of Portugal (10-4-1569 -. 16-3-1629). Daughter of William, Prince of Orange (1533-1584) and Anna of Saxony (1544-1577). Emilia secretly married in 1597 at The Hague Don Emanuel of Portugal (c. 1568-1638), illegitimate and impoverished pretender to the throne in exile. From this marriage 10 children were born, of whom two died young.