Possible Clues:

• Former U.N. leader Hammarskjöld
• Trygve's successor
• Statesman Hammarskjöld
• Mr. Hammarskjšld
• Nobelist Hammarskjold
• U.N.'s Hammarskjold
• Peace Nobelist Hammarskjöld
• Hammarskjöld of the U.N.
• Hammarskjöld of U.N. fame
• The U.N.'s ___ Hammarskjöld