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In page Maria Eleonora of Brandenburg:

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In the autumn of 1623 Maria Eleonora gave birth to a daughter, Christina, but the baby died the next year. At that time, the only surviving male heirs were the hated king of Poland and his sons. With Gustavus Adolphus risking his life in battles, an heir to the throne was anxiously awaited. In the autumn Maria Eleonora was pregnant for a third time. In May 1625 she was in good spirits and insisted on accompanying her husband on the royal yacht to review the fleet. There seemed to be no danger, as the warships were moored just opposite the castle, but a sudden storm nearly capsized the yacht. The queen was hurried back to the castle, but when she got there she was heard to exclaim: "Jesus, I cannot feel my child!". Shortly afterwards the longed-for son was stillborn.[citation needed]