| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
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| Frederick IX, king of Denmark |
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| 18991972, king of Denmark (194772), son and successor of Christian X. He married (1935) Princess Ingrid of Sweden. Because he did not have a son the constitution was amended in 1953 to allow for a female heir to the throne; Frederick was succeeded by his daughter, Queen Margaret II. |
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| | | The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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