 In the episcopate of Michael Zienkowicz (1730–1762), conflicts between the Jesuits and the Piarists arose, resulting in the closing of Piarist schools.Prince Ignacy Jakub Massalski (1762–1794) encouraged the reform of the clergy and devoted his immense fortune to the churches of his diocese.After the partitions of Poland–Lithuania, the Diocese of Vilna became part of the Russian Empire and no longer enjoyed freedom of relations with the Holy See.