Day of Valdemar and Reunion Day

Day of Valdemar and Reunion Day, celebrated every year on 15^th June, is one of Denmark’s most meaningful historical observances. It unites two major events, separated by seven centuries, into a single day of national memory:

1. the legendary appearance of the Dannebrog during King Valdemar II’s 1219 campaign, and
2. the Reunification of Northern Schleswig with Denmark in 1920.

The Legend Behind the Day of Valdemar

According to Danish tradition, on 15^th June, 1219, during the Battle of Lyndanisse, King Valdemar II fought Estonian forces. At a critical moment, the Dannebrog, the red flag with a white cross, was said to have fallen from the sky, inspiring the Danish troops to victory. This mythic event became central to Danish identity and is commemorated as Day of Valdemar, officially recognized in 1912.

The 1920 Reunification: Reunion Day

On 15^th June, 1920, Denmark celebrated the return of Northern Schleswig (Sønderjylland) after a democratic referendum held following Germany’s defeat in World War I.

• In Zone 1, 75% voted to join Denmark.
• In Zone 2, 80% voted to remain with Germany.

  As a result, the border was peacefully redrawn, and Northern Schleswig was reunited with Denmark.

This moment, known simply as Genforeningen, remains one of the most emotional chapters in Danish history, symbolising national unity and cultural resilience.

How Danes Celebrate 15^th June Today

Across Denmark, 15^th June is marked with traditions that honour both the flag and the reunification:

• Flag-raising ceremonies featuring the Dannebrog, celebrating its legendary origin.
• Historical commemorations of King Valdemar II and the 1219 battle.
• Reunification events in Sønderjylland, including speeches, concerts, and exhibitions.
• Community gatherings that highlight Danish culture, identity, and unity.

These celebrations blend myth, history, and national pride into a single shared experience.

Why This Day Matters

15^th June stands as a reminder of two defining themes in Danish history:

• Courage and legend — embodied in the story of the Dannebrog’s miraculous appearance.
• Democracy and self-determination — reflected in the peaceful 1920 referendum that restored part of Denmark’s lost territory.

Together, they form a narrative of resilience, unity, and national continuity.

Closing Reflection

Day of Valdemar and Reunion Day is more than a holiday, /it is a celebration of Denmark’s mythic past, historic justice, and enduring identity. The Dannebrog symbolizes the spirit of the nation, while the 1920 reunification represents the triumph of democratic will.