Question: Who was the most famous king of the House of Griffins, and King of Sweden, Denmark and Norway in the 14th and 15th centuries?

 He was the first King of the Nordic Kalmar Union, succeeding his adoptive mother Margaret I of Denmark, and was also Duke Eric I of Pomerania. Eric of Pomerania KG (1381 or 1382 – 24 September 1459) was King Eric (Eirik) III of Norway (1389–1442), King Eric VII of Denmark (1396–1439), and King Eric ("Ericus") of Sweden (1396–1439), in all three known mainly as "Erik af/av Pommern". <SEP>  The most prominent Griffin was Eric of Pomerania, who became king of the Kalmar Union in 1397, thus ruling Denmark, Sweden and Norway. 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 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. <SEP> 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." <SEP> The Kalmar Union was the personal union of the kingdoms of Denmark, Norway and Sweden during the 15th century.  The first king of the Kalmar Union was Eric of Pomerania.  His seal combined the coats of arms of Norway (center, as an inescutcheon upon a cross over all), Denmark (in dexter chief), Sweden (the Folkung lion, in dexter base) and Pomerania (a griffin, in sinister base), and in addition the Three Crowns symbol in sinister chief; the latter heraldic design predates the Kalmar Union, and is now mostly associated with the coat of arms of Sweden, but which during the 15th century came to represent the three kingdoms of the union.