Norway / Erik af Pommern (King Eric III)

Eric of Pomerania KG was King Eric (Eirik) III of Norway (1389–1442), King Eric VII of Denmark (1396–1439), and King Eric (Ericus) XIII (VIII) of Sweden (1396–1439), in all three known mainly as Erik af/av Pommern. 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.

Referring to Eric of Pomerania as King Eric XIII of Sweden is a later invention, counting backwards from Eric XIV (1560–1568), who adopted his numeral according to a fictitious history of Sweden. Going back into prehistory, it is not known how many Swedish monarchs were named Eric before this one (at least six were).