Danish Civil Flag. Flag Ratio: 28:37

The national flag of Denmark is more commonly known as the Dannebrog. The name means "Honourable cloth". The Dannebrog is red with a white cross that extends to the edges of the flag; the vertical part of the cross is shifted to the hoist side. The cross design of the Danish flag was subsequently adopted by the other Nordic countries: Sweden, Norway, Finland and Iceland.

According to ancient tradition, the flag was not made by humans but fell from the Heavens during the Battle of Reval (modern day Tallinn in Estonia), in 1219. The flag of Latvia, while not depicting a cross, also traces its origins to the colours from the battle of Reval.

Historians have a less colourful explanation for the origins of the flag: it is likely derived from old crusader banners of the time. The old coat of arms of Lübeck was red with a white cross, and the Danish king Eric of Pomerania, known by a white crossed flag, was also king of Lübeck.

The cross on the Dannebrog is similar to the cross of Saint Philip the Apostle.

The civil flag and ensign has proportions of 28:37. The state flag and ensign is a 28:31 rectangle with swallowtails giving it an overall 10:19 proportion. The war flag and ensigns are the same except that the war ensign uses a deeper shade of red. The cross' width is 1/7th of the hoist; the hoist is thus divided 12:4:12 whilst the fly is divided 12:4:21 (12:4:15 for the state flag's rectangular part).

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