Columbia subject headings:
Catholic Church--Byzantine rite--History.
Catholic Church--Relations--Orthodox Eastern Church.
Christian union.
Council of Florence (1438-1445 : Florence, Italy)
Orthodox Eastern Church--History.
Orthodox Eastern Church--Relations--Catholic Church.
Union of Brest
Harvard subject headings:
Catholic Church--Byzantine rite--History.
Catholic Church--Relations--Orthodox Eastern Church.
Christian union.
Council of Florence (1438-1445)
Orthodox Eastern Church--History.
Orthodox Eastern Church--Relations--Catholic Church.
Union of Brest
Princeton subject headings: