Flag of Denmark in the context of "Pituffik Space Base"

A national church is a Christian church associated with a specific ethnic group or nation state. The idea was notably discussed during the 19th century, during the emergence of modern nationalism.

Samuel Taylor Coleridge, in a draft discussing the question of church and state around 1828 wrote that

The Battle of Lyndanisse or Lindanise was fought on 15 June 1219 during the Northern Crusades, between the forces of the invading Kingdom of Denmark and the local non-Christian Estonians. The Danish victory in the battle, at the site of the later Hanseatic city of Reval (now Tallinn, Estonia) helped King Valdemar II of Denmark to subsequently claim the territory of northern Estonia as his participation in the crusade into Estonia had been undertaken in response to calls from the Pope.

The 1219 Battle of Lyndanisse is still well known to this day, especially amongst Danes and Estonians, because of a popular legend about the first ever Danish flag, the Dannebrog, which allegedly fell from the sky, as an apparently helpful divine intervention, just when the Danish Crusaders were about to lose the battle to the local pagans.

The Order of the Dannebrog (Danish: Dannebrogordenen) is a Danish order of chivalry instituted in 1671 by Christian V, inspired by the legend that the Dannebrog flag fell from the sky in 1219. The Order's ribbon reflects the flag's colors, white and red, and the badge takes the form of the Dannebrog cross, as used in the royal coat of arms since the 17th century.

Until 1808, membership in the Order was limited to fifty members of noble or royal rank, who formed a single class known as White Knights to distinguish them from the Blue Knights who were members of the Order of the Elephant. In 1808, the Order was reformed and divided into four classes.