John III of Sweden

John III (Swedish: Johan III, Finnish: Juhana III; 20 December 1537 – 17 November 1592) was King of Sweden from 1569 until his death. He was the son of King Gustav I of Sweden and his second wife Margaret Leijonhufvud. He was also, quite autonomously, the ruler of Finland, as Duke John from 1556 to 1563. In 1581 he assumed also the title Grand Prince of Finland. He attained the Swedish throne after a rebellion against his half-brother Eric XIV. He is mainly remembered for his attempts to close the gap between the newly established Lutheran Church of Sweden and the Catholic church, as well as his conflict with, and murder of, his brother.

John III
John III as portrayed by Dutch artist Johan Baptista van Uther in 1582.
King of Sweden
Grand Duke of Finland
ReignJanuary 1569 – 17 November 1592
Coronation10 July 1569
PredecessorEric XIV
SuccessorSigismund
Born20 December 1537
Stegeborg Castle
Died17 November 1592(1592-11-17) (aged 54)
Tre Kronor castle
Burial1 February 1594
Spouse
(m. 1562; died 1583)

(m. 1585)
IssueSigismund III, King of Poland and Sweden
Anna, Starosta of Brodnica and Golub
John, Duke of Östergötland
Sophia, Baroness de la Gardie (ill.)
HouseVasa
FatherGustav I of Sweden
MotherMargaret Leijonhufvud
Religionmediating between Lutheranism and Catholicism[1]
Signature
Image of King John on a wall of Stockholm Palace.

His first wife was Catherine Jagellonica of the Polish-Lithuanian ruling family, and their son Sigismund eventually ascended both the Polish-Lithuanian and Swedish thrones.