Tre Kronor (Swedish pronunciation: [ˈtreː ˈkrûːnʊr] or [ˈtreː ˈkrûːnɛr]) or Three Crowns Castle was a castle located in Stockholm, Sweden, on the site where Stockholm Palace is today. It is believed to have been a citadel that Birger Jarl built into a royal castle in the middle of the 13th century. The name "Tre Kronor" is believed to have been given to the castle during the reign of King Magnus Eriksson in the middle of the 14th century.
Most of Sweden's national library and royal archives were destroyed when the castle burned down in 1697, making the country's early history unusually difficult to document.
HistoryLayer draws the world as it was in any year from 123,000 BCE to
2026. Move the slider and the borders redraw for that year; the map
carries 23,890 events, 12,790 people, 837 wars and 13,183 cities, each
one readable in place. Signing in is optional and lets you keep what
you find.