Gustav Adolfsdagen is a general flag day

Flag days in Sweden

By Swedish law a number of days of the calendar year are designated as official flag days. This means that the Flag of Sweden is flown on all public flag poles and buildings. Hoisting of the Swedish flag on private flag poles on these days is also strongly encouraged, but not mandatory.Flying of...

, celebrated in Sweden

Sweden

Sweden , officially the Kingdom of Sweden , is a Nordic country on the Scandinavian Peninsula in Northern Europe. Sweden borders with Norway and Finland and is connected to Denmark by a bridge-tunnel across the Öresund....

 on November 6 in memory of king Gustavus Adolphus of Sweden

Gustavus Adolphus of Sweden

Gustav II Adolf has been widely known in English by his Latinized name Gustavus Adolphus Magnus and variously in historical writings also as Gustavus, or Gustavus the Great, or Gustav Adolph the Great,...

 (Swedish: Gustav II Adolf), who was killed on this day in 1632 at the Battle of Lützen

Battle of Lützen (1632)

The Battle of Lützen was one of the most decisive battles of the Thirty Years' War. It was a Protestant victory, but cost the life of one of the most important leaders of the Protestant alliance, Gustavus Adolphus of Sweden, which caused the Protestant campaign to lose direction.- Prelude to the...

. Gustav Adolfsdagen coincides with the Finnish Swedish Heritage Day

Finnish Swedish Heritage Day

Finnish Swedish Heritage Day is a general flag day, which is celebrated in Finland on November 6. The day celebrates the Finland-Swedish culture, and the bilinguality of Finland. The main celebrations are aired in the radio, and many smaller celebrations are held around Finland in schools...

.

The date has been celebrated since the early 19th century. It is especially popular in Gothenburg

Gothenburg

Gothenburg is the second-largest city in Sweden and the fifth-largest in the Nordic countries. Situated on the west coast of Sweden, the city proper has a population of 519,399, with 549,839 in the urban area and total of 937,015 inhabitants in the metropolitan area...

, which was founded by Gustavus Adolphus, and in Uppsala

Uppsala

- Economy :Today Uppsala is well established in medical research and recognized for its leading position in biotechnology.*Abbott Medical Optics *GE Healthcare*Pfizer *Phadia, an offshoot of Pharmacia*Fresenius*Q-Med...

, where the king donated a lot of money to the university

Uppsala University

Uppsala University is a research university in Uppsala, Sweden, and is the oldest university in Scandinavia, founded in 1477. It consistently ranks among the best universities in Northern Europe in international rankings and is generally considered one of the most prestigious institutions of...

.