Kettil – Sweden’s most powerful medieval man

Bishop Kettil Karlsson was a vigorous figure who launched wars and toppled kings, all while carrying out his religious duties. Being a bishop in the 15th century meant something rather different from what it does today.
  • Viking Age

    AD 800 – AD 1100

  • Middle Ages

    AD 1050 – AD 1520

  • Modern Age

    AD 1520 – AD 2025

Kettil Karlsson Vasa was born around 1433 into a wealthy and influential family. From early on he strove for the highest power. After his years of study, he became a canon, a member of the cathedral chapter, at Uppsala Cathedral. In 1458, Kettil Karlsson was appointed coadjutor, assistant to the ageing bishop of Linköping. The following year, in 1459, he succeeded him. At just about twenty-six years old, Kettil Karlsson was now bishop of Linköping.

At the Swedish History Museum you can see Kettil Karlsson’s mitre, the ceremonial headpiece worn by bishops.

Tall, pointed ceremonial bishop’s hat.

Kettil Karlsson's mitre

A symbol of authority

Kettil either had the mitre made immediately upon taking office, or he received it as a gift from the sisters of Vadstena abbey. The mitre radiated power, luxury and ambition. The round plaques are of gilded silver inlaid with cloisonné enamel, an ancient technique in which patterns are outlined with fine metal wires and then filled with gemstones or enamel in varied colours.

These plaques once adorned another mitre before being reused here. The nuns of Vadstena embroidered the fabric with gold, silk and pearls, depicting the Annunciation with the angel Gabriel and Mary, alongside the cathedral’s patron saints Peter and Paul.

Detailed portraits from a ceremonial bishops hat
Detail of Kettil Karlsson's mitre. Photo: Gabriel Hildebrand, The Swedish History Museum/SHM (CC BY 4.0)

Kettil Karlsson at war

Kettil Karlsson twice took up arms. The first time was in 1464, when his cousin Jöns Bengtsson (Oxenstierna) was imprisoned by King Christian I. With an army of peasants, men from Dalarna and mounted retainers, he managed after protracted fighting to defeat the royal forces at Hälleskogen, north of Haraker Church. The bishop now stood as the most powerful man in Sweden.

The second time came in the winter of 1464-65. The bishop rose in rebellion against the once more enthroned King Charles VIII (Karl Knutsson Bonde), whom Kettil Karlsson himself had helped recall from exile in Danzig. Again, the bishop prevailed.

Bishop Kettil Karlsson became regent of Sweden, and thus appears in the country’s list of rulers. His energy and hunger for power had at last carried him to the very summit of authority. But in the spring of 1465, Sweden was struck by the plague, or black death. On 11 August of that year, Kettil Karlsson succumbed to the pestilence at Stockholm Castle. He was buried in Linköping, aged only thirty-two.

Summary

Kettil Karlsson was born around 1433 and became Bishop of Linköping at the age of just 26. He took part in several battles and twice succeeded in defeating royal forces. For a short time, he was the most powerful man in Sweden and was appointed regent of Sweden. In 1465, he died of the plague at only 32 years of age. His mitre is preserved in the collections of the Swedish History Museum.

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