À LA FRONTIÈRE DU CHRISTIANISME LATIN ET ORTHODOXE LA GALICIE VOLHYNIE AUX XIV è XV è SIÈCLES 

After the invasion of Tatars in the 1230s 1240s the political situation of the former Galician Volhynian principality can be characterized as a border land between Tatars and Western neighbours. Concerning the ideas of princes the influence of Tatars should be neutralized with the growing of Western connections. These influences had consequences o n the structure of the church. Under the rule of Polish Kings the role of Latin Church was growing and a new ecclesiastical hierarchy was formed. The Lithuanian princes enlarged their territories in Eastern direction, but the efforts of Lithuanian princes concerning the stabilization of a new orthodox centre (met ropolia) remained without success. The simultaneous presence of both churches through the 14 th 15 th centuries prepared favourable circumstances for the foundation of the Greek Catholic Church in the 16 th century.