The first documented Orthodox brotherhood was that of Lviv, in 1463. They were consolidated in the aftermath of the Union of Brest (1596) in order to oppose the conversion of Orthodox Christians to the Uniate Church, the Counter-Reformation, and Polonization.[1] The brotherhoods attempted to resist state-supported Catholic missionary activity by publishing books in the Cyrillic script and by financing a network of Orthodox schools which offered education in both Old Church Slavonic and the vernacular Ruthenian language.[5]
The brotherhoods were also simultaneously engaged in defending the rights and liberties of the Orthodox burghers, particularly of those Ukrainian craftsmen and merchants from the arbitrary oppression of the Polish Catholic authorities.[3]
The activity of the Orthodox fraternities helped preserve the national culture of Ukraine and Belarus throughout the Counter-Reformation era.[6] Most were closed in the course of the 18th century when Greek-Catholic proselytism had been forbidden by the House of Romanov. Some were revived in the late 19th century in order to stem "atheist propaganda" of the Nihilists.[5]
The Ostroh bratstvo was reinstituted by Countess Bludova (1813-1891), an ardent admirer of the Ostrogski family. Orthodox immigrants to the U.S. formed brotherhoods to support church activities.