 The bishops of Vilnius, presiding over a vast diocese and being senators and members of the Council of Lords of Lithuania, could not give all their attention to the spiritual necessities of their flock; hence, from the fifteenth centuries they had coadjutors or suffragans.Many of these, particularly in the 16th and 17th centuries, were titular bishops of Methoni, Messenia (on the Peloponnesus).Among the most famous may be mentioned George Casimir Ancuta (d. 1737, author of "Jus plenum religionis catholicae in regno Poloniaw", showing that the Protestants and Orthodox had not the same rights as the Catholics.