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In page John VI Kantakouzenos:

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In 1367 Joasaph was appointed the representative of the Eastern Orthodox Church to negotiate with the Latin Patriarch Paul to attempt a reconciliation of the Eastern Orthodox and Catholic churches. They agreed to call a grand ecumenical council to be attended by the Pope and all the patriarchs, archbishops, and bishops of both the eastern and western churches.[3] This plan was subsequently refused by Pope Urban V and eventually nothing came of it.[citation needed]