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In page Ecumenical Patriarch of Constantinople:

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The patriarch was designated millet-başı (ethnarch) of the Millet of Rum, which included all Orthodox Christians under Ottoman rule, regardless of their ethnicity in the modern sense. This role was carried out by ethnic Greeks at their great peril, in the midst of enormous difficulties and traps[citation needed] and inevitably with mixed success. Several patriarchs were summarily executed by the Ottoman authorities, most notably Gregory V, who was lynched on Easter Monday 1821 in revenge for the outbreak of the Greek Revolution.