Jonas Goštautas

Jonas Gostautas or Goštautas was a Lithuanian nobleman from the Grand Duchy of Lithuania of the Gasztołd (Goštautai) noble family, a politician and skillful land owner. He served as Chancellor of Lithuania between 1443 and 1458 and was a very close advisor and mentor to Casimir IV Jagiellon before he became the third Jagiellonian King of Poland.