Charles VIII of Sweden (in reality Charles II), Charles I of Norway, also Carl (Swedish: Karl Knutsson), was king of Sweden (1448–1457, 1464–1465 and from 1467 to his death in 1470) and king of Norway (1449–1450).

Karl Knutsson was born in October 1408 or 1409, at Ekholmen Castle, the son of Knut Tordsson (Bonde), knight and member of the privy council (riksråd), and Margareta Karlsdotter (Sparre av Tofta), the only daughter and heiress of Charles Ulvsson, Lord of Tofta. His father Knut was first cousin of Erik Johansson Vasa's father. King Charles died 14 May 1470. His first marriage, in 1428, to Birgitta Turesdotter (Bielke) (died 1436) gave him his daughter Kristina. His second marriage, in 1438, to Katarina Karlsdotter (Gumsehuvud) (died in 1450) produced his second daughter Magdalena, who married Ivar Axelsson (Tott). He also had two children by his third wife (and former mistress) Kristina Abrahamsdotter, Anna and Karl. His father was said by contemporary legends to descend from a younger brother of King Eric IX (Saint Eric). His mother, an important heiress, descended from Jarl Charles the Deaf and consequently from some ancient Folkunge earls of Sweden, as well as from Ingegerd Knutsdotter, a daughter of Canute IV of Denmark and Adela of Flanders.

In 1434 he became a member of the Privy Council of Sweden and in October of the same year he assumed one of its most senior offices, Lord High Constable of Sweden, or Riksmarsk. Because of the growing dissatisfaction with King Eric of Pomerania among the Swedish nobility, Charles was in 1436 made Rikshövitsman, an office equating to Military Governor of the Realm, and finally replaced the king as an elected regent from 1438 to 1440, as the result of the rebellion by Engelbrekt Engelbrektsson. During Charles's brief regentship, the so-called Rebellion of David (a peasant rebellion) took place in Finland. Eric of Pomerania was forced to step down from the throne and in 1440 Christopher of Bavaria, was elected king of Sweden, Norway and Denmark. At the coronation of Christopher in September 1441, Charles was dubbed a knight and appointed Lord High Justiciar of Sweden, or Riksdrots. In October he resigned as Lord High Justiciar and resumed his office as Lord High Constable. From 1442 he was the military governor, hövitsman, at Vyborg in Finland (margrave of Viborg).

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