 Jonston was tutor and physician to the Leszczyński family, a devotee of Bacon and experimental knowledge, and author of "Naturae constantia", published in Amsterdam in 1632, whose geometrical method and naturalistic, almost pantheistic concept of the world may have influenced Benedict Spinoza.The Leszczyński family itself would produce an 18th-century Polish-Lithuanian king, Stanisław Leszczyński (1677–1766; reigned in the Polish-Lithuanian Commonwealth 1704–11 and again 1733–36), ""le philosophe bienfaisant"" ("the beneficent philosopher")—in fact, an independent thinker whose views on culture were in advance of Jean-Jacques Rousseau's, and who was the first to introduce into Polish intellectual life on a large scale the French influences that were later to become so strong.In 1689, in an exceptional miscarriage of justice, a Polish ex-Jesuit philosopher, Kazimierz Łyszczyński, author of a manuscript treatise, "De non existentia Dei" (On the Non-existence of God), was accused of atheism by a priest who was his debtor, was convicted, and was executed in most brutal fashion.