Question: What era did the husband of Dorothea of Brandenburg reign?

full_context: Document 1: Dorothea of Saxony: Dorothea of Saxony (German: "Dorothea von Sachsen" ; 4 October 1563, Dresden – 13 February 1587, Wolfenbüttel) was a Saxon princess from the House of Wettin and by marriage Duchess of Brunswick-Wolfenbüttel.
Document 2: List of Swedish consorts: This is a list of Swedish queens consort and spouses of Swedish monarchs and regents. The list covers a large time span and the role of a consort has changed much over the centuries. The first Swedish consorts are spoken of in legends. The consorts until c. 1000 are often semi-legendary, as are the monarchs. Between the 14th and 16th century, during periods of de facto Swedish independence from the formal union with Denmark, the Swedish regents did not have the title of king or queen, nor did the spouses of kings have the title of queen consort, although they had the equivalent position. Due to unions with Finland, Denmark and Norway, many of the Swedish consorts were also consorts of monarchs of these countries. Consorts listed during the period of 1380–1520 were in fact also consorts to monarchs of Denmark. The consorts listed during the period of 1814-1905 were also consorts to monarchs of Norway. Finland was from the Middle Ages a part of Sweden, and although there was no official title, such as "Queen Consort of Finland", from the 16th century until the year of 1809, the queen consort of Sweden also held the title "Grand Princess of Finland."
Document 3: 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.
Document 4: Christopher of Bavaria: Christopher of Bavaria (26 February 1416 – 5/6 January 1448) was King of Denmark (1440–48, as Christopher III), Sweden (1441–48) and Norway (1442–48) during the era of the Kalmar Union.
Document 5: Dorothea of Brandenburg: Dorothea of Brandenburg (1430/1431 – 10 November 1495) was Queen consort of Denmark (1445–1448 and 1449–1481), Norway (1445–1448 and 1450–1481), and Sweden (1447–1448 and 1457–1464) two times each by marriage to Christopher of Bavaria and Christian I of Denmark. She served as interim regent during the interregnum in 1448, and as regent in the absence of her second spouse during his reign.
Document 6: House of Griffins: The House of Griffins or House of Pomerania (German: "Greifen" ; Polish: "Gryfici" ), also known as "House of Greifen", was a dynasty of dukes ruling the Duchy of Pomerania from the 12th century until 1637. The name "Griffins" was used by the dynasty after the 15th century and had been taken from the ducal coat of arms. Wartislaw I (around 1091 – died August 9, 1135) was the first historical ruler of the Duchy of Pomerania and the founder of the Griffin dynasty. The most prominent Griffin was Eric of Pomerania, who became king of the Kalmar Union in 1397, thus ruling Denmark, Sweden and Norway. The last Griffin duke of Pomerania was Bogislaw XIV, who died during the Thirty Years' War, which led to the division of Pomerania between Brandenburg-Prussia and Sweden. Duchess Anna von Croy, daughter of Duke Bogislaw XIII and the last Griffin, died in 1660.
Document 7: Sweden in Union with Norway: The Union between Sweden and Norway is an overriding theme of the history of Sweden in the 19th century. On 4 November 1814, the kingdoms of Sweden and Norway formed a personal union under one king. The two countries had completely separate institutions, except for the foreign service led by the king through the Swedish foreign minister.
Document 8: Christopher I of Denmark: Christopher I (Danish: "Christoffer I" ) (1219 – 29 May 1259) was King of Denmark between 1252 and 1259. He was the son of Valdemar II of Denmark by his wife, Infanta Berengária of Portugal. He succeeded his brothers Eric IV Plovpenning and Abel of Denmark on the throne. Christopher was elected King upon the death of his older brother Abel in the summer of 1252. He was crowned at Lund Cathedral on Christmas Day 1252.
Document 9: Margrethe II of Denmark: Margrethe II (Danish: "Margrethe 2." , ] ; Faroese: "Margreta 2." ; Greenlandic: "Margrethe II" ; full name: "Margrethe Alexandrine Þórhildur Ingrid"; born 16 April 1940) is the Queen of Denmark. She is also the supreme authority of the Church of Denmark and Commander-in-Chief of the Danish Defence. Born into the House of Glücksburg, a royal house with origins in Northern Germany, she was the eldest child of Frederick IX of Denmark and Ingrid of Sweden. She succeeded her father upon his death on 14 January 1972, having had become heir presumptive to her father in 1953, when a constitutional amendment allowed women to inherit the throne. On her accession, Margrethe became the first female monarch of Denmark since Margaret I, ruler of the Scandinavian kingdoms in 1375–1412 during the Kalmar Union. In 1967, she married Henri de Laborde de Monpezat, with whom she has two sons: Crown Prince Frederik (born 1968) and Prince Joachim (born 1969). She has been on the Danish throne for 45 years, becoming the second-longest-reigning Danish monarch after her ancestor Christian IV.
Document 10: Dorothea of Brandenburg, Duchess of Mecklenburg: Dorothea of Brandenburg (9 February 1420, Berlin – 19 January 1491, Benedictine monastery at Rehna) was a princess of Brandenburg by birth and by marriage Duchess of Mecklenburg.
Document 11: Juliana Maria of Brunswick-Wolfenbüttel: Juliana Maria of Brunswick-Wolfenbüttel-Bevern (Danish: "Juliane Marie"; 4 September 1729 – 10 October 1796) was queen of Denmark between 1752 and 1766, second consort of king Frederick V of Denmark and Norway, mother of the prince-regent Hereditary Prince Frederick of Denmark and Norway and herself de facto regent 1772–1784. King Christian VIII of Denmark descends from her.
Document 12: John, King of Denmark: John (Danish and Norwegian: "Hans" ; Swedish: "Johan" ; né "Johannes") (2 February 1455 – 20 February 1513) was a Scandinavian monarch under the Kalmar Union. He was King of Denmark (1481–1513), Norway (1483–1513) and as John II (Swedish: "Johan II" ) Sweden (1497–1501). From 1482 to 1513, he was concurrently Duke of Schleswig and Holstein in joint rule with his brother Frederick. He currently remains the only King of Denmark since the mid-15th century to not be named Christian or Frederick, if one does not include the current Queen of Denmark, Margrethe II.
Document 13: Philippa of England: Philippa of England (4 June 1394 – 5 January 1430), also known as Philippa of Lancaster, was Queen of Denmark, Sweden, and Norway from 1406 to 1430 by marriage to Eric of Pomerania. She was the daughter of King Henry IV of England by his first spouse Mary de Bohun and the younger sister of King Henry V. Queen Philippa participated significantly in state affairs during the reign of her spouse, and served as regent of Denmark from 1423 to 1425.
Document 14: Christian VIII of Denmark: Christian VIII (18 September 1786 – 20 January 1848) was the King of Denmark from 1839 to 1848 and, as Christian Frederick, King of Norway in 1814.
Document 15: Ludwig II of Bavaria: Ludwig II (German: "Ludwig Otto Friedrich Wilhelm" ; English: Louis Otto Frederick William ; 25 August 1845 – 13 June 1886) was King of Bavaria from 1864 until his death in 1886. He is sometimes called the Swan King, Mad King Ludwig or der Märchenkönig (the 'Fairy Tale King'). He also held the titles of Count Palatine of the Rhine, Duke of Bavaria, Duke of Franconia, and Duke in Swabia.
ground_truth: Kalmar Union