Ukrainian Greek Catholic Church

The Ukrainian Greek Catholic Church is a Byzantine Rite Eastern Catholic Church in full communion with the Holy See. It is the second-largest particular church in the Catholic Church.

The church is one of the successor churches to the acceptance of Christianity by Grand Prince Vladimir the Great of Kiev, in 988. Its predecessor appeared in 1596 with the signing of the Union of Brest between the Ruthenian Orthodox Church led by Michael Rohoza and the Holy See. Following partitions of Poland, in 1808 the eparchies of original Ruthenian Uniate Church that were split three ways between Austrian Empire, Prussia, and Russian Empire. Those three eparchies under Austrian jurisdiction were reorganized as the Greek Catholic Church soon after liquidation of all five eparchies that ended up in Russia. The Greek Catholic Church in Austria became a single survivor of the original uniate church of the Brest Union.