Jonas Goštautas

Jonas Gostautas or Goštautas (Polish: Jan Gasztołd; c. 1393 in Geranainys or Vilnius – before 1 September 1458 in Vilnius) 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.

Gostautas was not his surname, but a pagan Lithuanian given name retained after baptism by his immediate ancestor, while Jonas was his Christian name. His heirs, e.g., his sons like Martynas Goštautas, perhaps inherited the name as a surname. In 1413 at the Union of Horodło, Jonas was adopted by the Polish nobles into the Abdank clan.