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Wiki information Shumliansky:
Iosyf Shumliansky was a Polish bishop in Lviv, best known for restoring unity with the Holy See in 1700.
Athanasius was Brother of Iosyf Shumliansky and a former Orthodox bishop of Lutsk from 1686 to 1688. In 1688 he converted to the Catholic religion, and the union in the diocese declared his successor Dionysius.