John Jonston

From 1611 Jonston attended the school of the Bohemian Brothers in Ostroróg, then the Schoenaichianum in Bytom, and from 1619 the gymnasium in Toruń, Royal Prussia.

Until 1628 he was a private tutor in the household of the Kurtzbach-Zawadski family in Leszno, where he was an active member of the Czech Brethren community.

In 1628 Jonston traveled to the Holy Roman Empire (Wittenberg, Leipzig, Frankfurt, Franeker) to resume his studies.

That year he was offered a chair of philosophy at Deventer but declined it, preferring to return to the Commonwealth to become once again a private tutor.

Jonston returned to Leszno, remaining a Leszczyński retainer, in whose service he had the title of Archiater et Civitatis Lesnensis Physicus Ordinarius.

In 1665, following the Polish-Swedish War (The Deluge), which worsened public attitudes toward the Commonwealth's Protestants, he retired from Leszno to his newly bought estate.