Kammala jumla mai zuwa: An kafa eparchy a matsayin Eparchy na Orthodox na Halych suffragan zuwa Metropolitan na Kiev a wani lokaci a tsakiyar karni na 12, tare da wurinsa na asali a Halych. A cikin 1303 an ɗaukaka shi zuwa matsayin babban birni kuma ya riƙe wannan matsayin a cikin lokuta da yawa na ƙarni na 14, har sai bayan 1401 taken lardin da aka watsar ya koma Metropolitan na Kyiv. Bayan karni na 14
Galician-Volhynia Wars, an tabbatar da diocese bayan Roman Katolika Archdiocese na Lviv.