Sigismund III Vasa
Early life

Born on 20 June 1566 at Gripsholm Castle, Sigismund was the second child and only son of Catherine Jagiellon and Grand Duke John of Finland. The couple was being held prisoner at Gripsholm since 1563 when John staged a failed rebellion against his deranged brother Eric XIV of Sweden. Although Protestant Christians were growing political wing in Poland at the time, Sigismund was raised as a Roman Catholic. His mother Catherine was the daughter of Polish king Sigismund the Old and Bona Sforza of Milan, all of whom where practicing Catholics. Sigismund's older sister Isabella died aged two in 1566. His younger sister Anna was a Lutheran, but the close relationship between the two siblings remained unchanged until her death in 1625.

In October 1567, Sigismund and his parents were released from prison at the request of his uncle Charles. In January 1569, Eric XIV was deposed and Sigismund's father ascended the throne of Sweden as John III. He maintained good relations with his father despite John's second marriage to Gunilla Bielke, a Protestant noble lady of lower status and Catherine's former maid of honour. In 1589, Sigismund's half-brother John, the future Duke of Östergötland, was born.

As a child, Sigismund was tutored in both Polish and Swedish, thus making him bilingual. He was also proficient in German, Italian, and Latin. Catherine ensured that her son was educated in the spirit of Catholicism and Polish patriotism; the young prince was made aware of his blood connection to the Jagiellonian dynasty which ruled Poland in its finest period for two hundred years. Although Sigismund in his youth enjoyed reading and learning, observers did not acknowledge his intelligence. He was handsome, rather tall, and of slim build, but timid and an introvert who became heavily influenced by the teachings of the church. Nevertheless, Sigismund was undoubtedly multitalented and artistically inclined.
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