Denmark’s national flag is called the Dannebrog.
The Dannebrog is a red flag with a white Scandinavian cross extending to the edges. Danish tradition says it fell from the sky during the Battle of Valdemar in Estonia in 1219, although historians treat that story as a later legend rather than a verified eyewitness account.
The flag’s documented history is medieval, and Denmark is often described as having the world’s oldest continuously used national flag. Its cross design influenced the flags of several other Nordic countries, including Norway, Sweden, Finland and Iceland.
The name Dannebrog is commonly interpreted as “Danish cloth” or “Danish flag,” though its exact medieval wording and meaning have been debated. Dannebrog is used by the Danish state, institutions and private citizens, and flag-flying traditions are especially prominent at birthdays and national celebrations.