John Jagiellon
Bishop of Poznań and illegitimate son of Sigismund I the Old, King of Poland · Religious Figures · Lived 1499 to 1538 · aged 39
John of the Lithuanian Dukes was Bishop of Vilnius (1519-36) and of Bishop of Poznań (1536-38). He was the bishop when Protestantism was making the first inroads into the Grand Duchy of Lithuania and took the first steps in combating it.
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John was an illegitimate son of Sigismund I the Old, King of Poland and Grand Duke of Lithuania, and his mistress Katarzyna Telniczanka.
