Enno III of Ostfriesland (1563–1625) John III of Rietberg (1566–1625) Christopher of Ostfriesland (1569–1636) Edzard of Ostfriesland (1572?–1573) Elizabeth of Ostfriesland (1572?–1573) Sophia of Ostfriesland (1574–1630) Karl Otto of Ostfriesland (1577–1603) Maria of Ostfriesland (1582–1616); married Julius Ernst, Duke of Brunswick-Dannenberg and had issue.