Kazimierz Łyszczyński

Kazimierz Łyszczyński
Born(1634-03-04)4 March 1634
Died30 March 1689(1689-03-30) (aged 55)
Warsaw, Polish–Lithuanian Commonwealth
Cause of deathExecution
NationalityPolish
Other namesCasimir Liszinski
Occupations
Philosophical work
EraAge of Enlightenment
Region
Main interestsReligious skepticism
Notable worksOn the non-existence of God
Notable ideasAtheism in Poland

Kazimierz Łyszczyński (Polish pronunciation: [kaˈʑimjɛʂ wɨˈʂt͡ʂɨj̃skʲi]; 4 March 1634 – 30 March 1689), also known in English as Casimir Liszinski, was a nobleman, philosopher, and soldier in the ranks of the Sapieha family, who was accused, tried, and executed for atheism in 1689.

For eight years he studied philosophy as a Jesuit and then became a podsędek (supply judge) in legal cases against the Jesuits concerning estates. He wrote a treatise entitled On the Non-Existence of God and was later executed on charges of atheism. His trial has been criticised and is seen as a case of legalised religious murder in Poland.