The Duchy of Holstein was established by a Scandinavian monarch under what union?
Christian I of Denmark Christian I (February 1426 – 21 May 1481) was a Scandinavian monarch under the Kalmar Union. He was King of Denmark (1448–1481), Norway (1450–1481) and Sweden (1457–1464). From 1460 to 1481, he was also Duke of Schleswig (within Denmark) and Count (after 1474, Duke) of Holstein (within the Holy Roman Empire). He was the first Danish monarch of the House of Oldenburg.
Lübeck law The Lübeck law (German: "Lübisches (Stadt)Recht" ) was the constitution of a municipal form of government developed at Lübeck, now in Schleswig-Holstein, after it was made a free city in 1226. The law provides for self-government. It replaced the personal rule of tribal monarchs descending from ancient times or the rule of the regional dukes and kings that had been established by Charlemagne. The latter held all of his aristocratic vassals personally responsible for the defence, health and welfare of the tribesmen settled on their estates, including the towns. The Lübeck Law in theory made the cities to which it applied independent of royalty.