John (in Swedish Johan) (18 April 1589 at Uppsala Castle – 5 March 1618 at Bråborg Castle in Östergötland) was a Swedish royal dynast. He was 1590-1606 titular Duke of Finland and 1606-18 reigning Duke of Östergötland.
His father was John III of Sweden (1537-92) and mother was Gunilla Bielke (1568-97) .
John's half-brother was Sigismund III of Poland and Sweden (1566-1632, reigned Sweden 1592-99, Poland-Lithuania 1587-1632), his uncle was Charles...
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John (in Swedish Johan) (18 April 1589 at Uppsala Castle – 5 March 1618 at Bråborg Castle in Östergötland) was a Swedish royal dynast. He was 1590-1606 titular Duke of Finland and 1606-18 reigning Duke of Östergötland.
His father was John III of Sweden (1537-92) and mother was Gunilla Bielke (1568-97) .
John's half-brother was Sigismund III of Poland and Sweden (1566-1632, reigned Sweden 1592-99, Poland-Lithuania 1587-1632), his uncle was Charles IX of Sweden (ruled 1599-1611) and his first cousin was Gustav II Adolf of Sweden (lived 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, Gustav Adolf of Södermanland, the future king. 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 in 1599 from the Swedish throne after a Swedish...
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