May 7, 1697—
The castle Slottet Tre Kronor burns down. The castle is believed to have been a citadel that statesman Birger Jarl built into a castle in Stockholm in the mid 13th century. The name “Tre Kronor” (Three Crowns) is believed to have been given to the castle during the reign of King Magnus IV in the middle of the 14th century. Most of Sweden's national library and royal archives were destroyed in the fire, making the country's early history unusually difficult to document.