activities in Rzeczpospolita and how the Sejm's are created) - anonymously Polonia defensa contra Joannem Barclaium (1648, in Latin) (Defense of Poland to John Barclay)- a reply to Icon Animorum of John Barclay, which Łukasz considered an unfair depiction of Poland Coś nowego... (1652) (Something new...) De officiis libri tres (1659) - textbook on ethics, used by many Jesuit schools and often reprinted Poeta nowy (c. 1661) (New Poet) References External links Fragments of works in Polish Biography note in Polish Another bio note in Polish 1612 births 1666 deaths People from Sieraków Lukasz Opalinski (1612-1666) Book and manuscript collectors