John, Duke of Ostrogothia
| John | |
|---|---|
| Duke of Östergötland | |
John, Duke of Ostrogothia
(1589–1618) |
|
| Born | 18 April 1589 Uppsala Castle, Uppsala, Sweden |
| Died | 5 March 1618 (aged 28) Bråborg Castle, Bråviken, Norrköping, Östergötland, Sweden |
| Burial | Linköping Cathedral |
| Spouse |
Princess Maria Elizabeth of Sweden Kerstin Månsdotter |
| Issue | Hans Johansson (ill.) |
| House | Vasa |
| Father | John III of Sweden |
| Mother | Gunilla Bielke |
John of Sweden, Duke of Östergötland (in Swedish Johan) (18 April 1589 at Uppsala Castle – 5 March 1618 at Bråborg Castle in Östergötland) was a Swedish royal dynast. He was titular Duke of Finland 1590–1606 and reigning Duke of Östergötland 1606–18.
His father was John III of Sweden and his mother was Gunilla Bielke. John's half-brother was King Sigismund III of Poland (1566–1632, reigned in Sweden in 1592–99, and in the Polish–Lithuanian Commonwealth in 1587–1632). His uncle was Charles IX of Sweden, who ruled from 1599 to 1611, and his first cousin was Gustav II Adolf of Sweden (1594–1632).
At the age of one, the baby John was created Duke of Finland, Count of Åland, and Count of Bråborg. He was tutored together with his first cousin, the five-years-younger hereditary prince and future king, Gustav Adolf of Södermanland. John's uncle Duke Charles, then king, treated him like his own son.
After the Battle of Stångebro, Duke John's Catholic half-brother Sigismund was declared deposed from the Swedish throne in 1599 after a Swedish civil war. The 10-year-old John would have been the next king according to the line of succession. His uncle Charles, Duke of Södermanland (1550–1611), the closest adult in the line of succession, took up the regency, and, until 1604, no king was proclaimed.
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