The Hanseatic League was a medieval commercial and defensive network of merchant guilds and market towns in Central and Northern Europe. Growing from a few North German towns in the late 12th century, the League expanded between the 13th and 15th centuries and ultimately encompassed nearly 200 settlements across eight modern-day countries, ranging from Estonia in the north and east, to the Netherlands in the west, and extended inland as far as Cologne, the Prussian regions and Kraków, Poland.
Margaret I was Queen regnant of Denmark, Norway, and Sweden from the late 1380s until her death, and the founder of the Kalmar Union that joined the Scandinavian kingdoms together for over a century. She had been queen consort of Norway from 1363 to 1380 and of Sweden from 1363 to 1364 by marriage to Haakon VI. Margaret was known as a wise, energetic and capable leader, who governed with "farsighted tact and caution," earning the nickname "Semiramis of the North". Also famous derisively as "King Breechless", one of several derogatory nicknames once thought to have been invented by her rival King Albert of Sweden, she was also known by her subjects as "Lady King", which became widely used in recognition of her capabilities. Knut Gjerset calls her "the first great ruling queen in European history."
Haakon VI, also known as Håkan Magnusson, was King of Norway from 1343 until his death and King of Sweden between 1362 and 1364. He is sometimes known as Haakon Magnusson the Younger to distinguish him from his great-grandfather, Haakon V.
Valdemar IV Atterdag, Valdemar Christoffersen or Waldemar was King of Denmark from 1340 to 1375. He is mostly known for his reunion of Denmark after the bankruptcy and mortgaging of the country to finance wars under previous rulers.
The Strelasund or Strela Sound is a sound or lagoon of the Baltic Sea which separates Rügen from the German mainland. It is crossed by a bridge called the Strelasund Crossing from Stralsund. It runs northwest to southeast from a small shallow bay just north of Stralsund called the Kubitzer Bodden through to another such bay, the Greifswalder Bodden in the southeast. The sound is nowhere much more than 3 km wide, reaching its greatest width towards its southeast end. It is roughly 25 km long.
The State of the Teutonic Order was a theocratic state located along the southeastern shore of the Baltic Sea in northern Europe. It was formed by the knights of the Teutonic Order during the early 13th century Northern Crusades in the region of Prussia. In 1237, the Livonian Brothers of the Sword merged with the Teutonic Order of Prussia and became known as its branch – the Livonian Order. At its greatest territorial extent during the early 15th century, the State encompassed Chełmno Land, Courland, Gotland, Livonia, Estonia, Neumark, Pomerelia, Prussia and Samogitia.
The Skåne Market or Scania market was a major fish market for herring which took place annually in Scania during the Middle Ages. From around 1200, it became one of the most important events for trade around the Baltic Sea and made Scania into a major distribution center for West-European goods bound for eastern Scandinavia. The Scania Market continued to be an important trade center for 250 years and was a cornerstone of the Hanseatic League's wealth.
The Battle of Helsingborg was fought on 8 July 1362 between the Danish and Hanseatic fleets during the Danish-Hanseatic War (1361-1370).
The Confederation of Cologne was a medieval military alliance formed to combat the Kingdom of Denmark. It was established on 19 November, 1367 by several cities in the Hanseatic League, several cities in Holland, Zeeland and Zuiderzee.
The establishment of a dominium maris baltici was one of the primary political aims of the Danish and Swedish kingdoms in the late medieval and early modern eras. Throughout the Northern Wars the Danish and Swedish navies played a secondary role, as the dominium was contested through control of key coasts by land warfare.
The Dano-Hanseatic War, also known as the Kalmar War with the Hanseatic League, or the Danish-Hanseatic War of 1426-1435, was an armed trade conflict between the Danish-dominated Kalmar Union and the Hanseatic League led by the Free City of Lübeck.
Events from the 14th century in Denmark.
Events from the 1360s in Denmark.
The Danish–Hanseatic War (1361–1370) was both a trade and territorial conflict mainly between the Kingdom of Denmark, led by King Valdemar IV, and the Hanseatic League, the latter of which was led by the rich and powerful merchant city of Lübeck. Though the first few years of the war resulted in several Danish victories, and even led to a beneficial truce for Denmark in 1365, the Hanseatic League, furious at the terms of the truce, resumed hostilities along with several allies and managed to defeat the Danes.
The Danish–Hanseatic rivalry was a rivalry between the German Hanseatic League and the Kingdom of Denmark, which lasted from the late 14th century up until the dissolution of the Hanseatic League in the 1660s. It consisted of many direct wars and proxy wars. Though both states were generally competitors across the 3 centuries in the Baltic Sea, there were periods of time where the two states coexisted peacefully, such as during the reign of Margaret I.
The Siege of Lindholmen was a siege of the former Danish castle of Lindholmen in Scania during the Danish-Hanseatic War of 1361 – 1370 between Sueco–Hanseatic and Danish forces. The siege ended in a Danish victory: the Hanseatic leader Bruno Warendorp was killed, and the siege was subsequently lifted.
The Siege of Copenhagen or the Capture of Copenhagen, was a looting and siege of Copenhagen and Absalon's Castle in 1368 between Denmark and the Hanseatic League, during the Danish-Hanseatic War (1361–1370). The city was looted and Absalon's castle was destroyed.
The Siege of Vordingborg was a siege between the Hanseatic and Danish forces at Vordingborg, Zealand during the Danish–Hanseatic War (1361–1370). The Danes managed to defend Vordingborg for two years until peace was settled at Stralsund.
The Siege of Helsingborg was a siege of the then-Danish city of Helsingborg between 1368 and 1369 during the Danish–Hanseatic War (1361–1370). Despite withstanding many sieges, Helsingborg would capitulate to the Hanseatic League.
The Siege of Kolding also known as the Siege of Koldinghus, was a siege by the County of Holstein on the Danish castle of Koldinghus in 1368 during the Danish–Hanseatic War (1361–1370). The siege would end inconclusive for both sides, however, the commander of the castle, Peder Iversøn, promised to surrender if King Valdemar IV of Denmark would die, abdicate, or lose the kingdom. Presumeably, Iversøn surrendered at last, since he would not be mentioned in the later peace talks.
Denmark 
Hanseatic League 
