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In page Olav V:

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During the summer of 1990, Olav suffered from health problems, but recovered somewhat during Christmas the same year. On 17 January 1991, he suffered a heart attack and died at his residence in the Royal Lodge Kongsseteren in Oslo. An interview given by his son Harald and hints in a biography by Jo Benkow, who was the President of the Storting at that time, mention the possibility that King Olav suffered great trauma upon learning of the outbreak of Operation Desert Storm,[citation needed] which began on the day he died. Harald succeeded him as king.