It all resulted in the almost complete abandonment of Ruthenian culture, traditions and the Orthodox Church by the Ruthenian higher class. The creation of the Greek Catholic Church, following the Union of Brest which sought to break the relations between Orthodox clergy in the Commonwealth and the Patriarchate in Moscow, put the Ruthenian people under stronger influence of Polish culture. This was accompanied by the spread of the Roman Catholic Church in the Ruthenian lands. Dioceses of the Roman Catholic Church were established as early as the 14th and 15th centuries by the Grand Dukes of Lithuania. After the Union of Lublin Jesuit schools were established by Ruthenian magnates. Some Ruthenian magnates like Sanguszko, Wiśniowiecki and Kisiel, resisted the cultural Polonization for several generations, with the Ostrogski family being one of the most prominent examples. Remaining generally loyal to the Polish state, the magnates, like Ostrogskis, stood by the religion of their forefathers, and supported the Orthodox Church generously by opening schools, printing books in Ruthenian language (the first four printed Cyrillic books in the world were published in Cracow, in 1491) and giving generously to the Orthodox churches' construction. However, their resistance was gradually waning with each subsequent generation as more and more of the Ruthenian elite turned towards Polish language and Catholicism. Still, with most of the educational system getting Polonized and the most generously funded institutions being to the west of Ruthenia, the Ruthenian indigenous culture further deteriorated. In the Polish Ruthenia the language of the administrative paperwork started to gradually shift towards Polish. By the 16th century the language of administrative paperwork in Ruthenia was a peculiar mix of the older Church Slavonic with the Ruthenian language of the commoners and the Polish language. With the Polish influence in the mix gradually increasing it soon became mostly like the Polish language superimposed on the Ruthenian phonetics. The total confluence of Ruthenia and Poland was seen coming. As the Eastern Rite Greek-Catholic Church originally created to accommodate the Ruthenian, initially Orthodox, nobility, ended up unnecessary to them as they converted directly into the Latin Rite Catholicism en masse, the Church largely became an hierarchy without followers. The Greek Catholic Church was then used as a tool aimed to split even the peasantry from their Ruthenian roots, still mostly unsuccessfully. The commoners, deprived of their native protectors, sought protection through the Cossacks, who, being fiercely Orthodox, tended also