Andrzej Frycz Modrzewski was one of the greatest theorists of political thought in Renaissance Europe. His most famous work, "On the Improvement of the Commonwealth", was published in Kraków in 1551. Modrzewski criticized the feudal societal relations and proposed broad realistic reforms. He postulated that all social classes should be subjected to the law to the same degree, and wanted to moderate the existing inequities. Modrzewski, an influential and often translated author, was a passionate proponent of peaceful resolution of international conflicts. Bishop Wawrzyniec Goślicki (Goslicius), who wrote and published in 1568 a study entitled "De optimo senatore" ("The Counsellor" in the 1598 English translation), was another popular and influential in the West political thinker.