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Dag Hammarskjöld

Historical Figure

Dag Hammarskjöld

1905–1961

UN Secretary-General from 1953 to 1961

Early 20th Century

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Biography

Dag Hjalmar Agne Carl Hammarskjöld was a Swedish economist and diplomat who served as the second secretary-general of the United Nations from April 1953 until his death in a plane crash in September 1961. As of 2026, he remains the youngest person to have held the post, having been only 47 years old when he was elected. He was a son of Hjalmar Hammarskjöld, who served as Prime Minister of Sweden from 1914 to 1917.

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In Their Own Words (5)

Timeline

The story of Dag Hammarskjöld, told in moments.

1953 Event

Elected Secretary-General of the United Nations at 47, the youngest person to hold the post. He was chosen as a compromise candidate. The Soviets thought he'd be weak. He wasn't.

1956 Event

Created the first UN peacekeeping force during the Suez Crisis. UNEF deployed to Egypt without a blueprint. The concept of "Blue Helmets" was essentially invented on the spot.

1961 Event

Personally negotiated the release of American prisoners during the Congo Crisis, flying into active conflict zones when career diplomats wouldn't.

1961 Death

Killed when his plane crashed near Ndola, Northern Rhodesia, while en route to ceasefire negotiations in the Congo. He was 56. Investigations over the next six decades have never definitively explained the crash. He was posthumously awarded the Nobel Peace Prize.

More from the Early 20th Century

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