The Dutch royal family descends from the national hero prince William I the 
silent of Orange (1533-1584). His greatgrandson, William III (1650-1702), became 
king of Great-Britain. William III's aunt, Albertine Agnes of Orange-Nassau 
(1634-1696), had married a grandson of William I's brother. Their marriage 
united the Nassau branches of Holland and Friesland. 

Willem Frederik of Nassau-Dietz (1613-1664), prince of Nassau-Dietz, stadholder 
of Friesland 1640, Groningen and Drenthe 1650, married 1652 Albertine Agnes of 
Orange-Nassau (1634-1696), 5th daughter of Frederick Henry of Orange-Nassau, 
stadholder of Holland, Zealand, Utrecht, Overijssel and Guelders. Children: 
    Amalia (1655-1695) married 1690 Johann Wilhelm of Saxony-Eisenach 
    (1666-1729) 
    Henry Casimir II of Nassau-Dietz (1657-1696), stadholder of Friesland and 
    Groningen 1664 and Drenthe 1674, married 1683 his cousin Henriette Amalie of 
    Anhalt-Dessau (1666-1726). Children: 
         
        Willem George Friso (1685-1686) 
        Henriette Albertine (1686-1754) 
        Johan Willem Friso (1687-1711), prince of Nassau-Dietz 1696 and Orange 
        1702, stadholder of Friesland and Groningen 1696, drowned near Strijen, 
        married 1709 Marie Louise of Hesse-Cassel (1688-1765). Children: 
            Anna Charlotte Amalie (1710-1777), to the right, married 1727 
            Frederick of Baden-Durlach (1702-1732) 
            Willem IV of Orange-Nassau (1711-1751), heir. 
        Maria Amalia (1689-1771) 
        Sophia Hedwig (1690-1734) married 1708, divorced 1710 Karl Leopold of 
        Mecklenburg-Schwerin (1678-1747). 5 days after he obtained a divorce, 
        Karl Leopold contracted a morganatic marriage and in 1711 he obtained 
        his second divorce. In 1716 he married 3rdly Catharine Iwanowna of 
        Russia (1692-1733) and their daughter, Anna Leopoldowna, gave birth to 
        tsar Iwan VI of Russia (1740-1764). 
        Isabella Charlotte (1692-1757) married 1725 Christian of 
        Nassau-Dillenburg (1688-1739) 
        Johanna Agnes (1693-1765) 
        Louisa Leopoldina (1695-1758) 
        Henrietta Casimira (1696-1738)