The rulers of the Roman Catholic Grand Duchy of Lithuania (the GDL) from the very time of Lithuania’s baptizing in 1387−1413 by the Vatican had a plan to Catholicize all Orthodox believers of the GDL among whom overwhelming majority were the Slavs. As a consequence, the relations with Moscow became very hostile as Russia accepted a role of the protector of the Christian Orthodox believers and faith and therefore the Church Union of Brest was seen as a criminal act by Rome and its client-state of the Republic of Two Nations (Poland-Lithuania) […]