Formation of the Kalmar Union by Margaret I

Margaret I of Denmark successfully united Denmark, Norway, and Sweden under the Kalmar Union. This union was ceremoniously established in the city of Kalmar, Sweden, bringing the three kingdoms together for the first time. The formation aimed to strengthen alliances and consolidate power against external threats, especially from the Hanseatic League. The event marked a pivotal moment in the Nordic countries' history, as it sought to create a unified front for economic and political stability.