To answer the question as to which Eastern & Oriental Orthodox Churches were represented and by whom:
Ecumenical Patriarchate:
His All-Holiness Bartholomew I, Archbishop of Costantinopole & Ecumenical Patriarch
His Eminence Gennadios, Archbishop of Italy & Exarch of Eastern Europe
His Eminence Cyril, Metropolitan of Imbros
His Eminence Johannis, Metropolitan of Pergamo
Rev.Deacon Dositheos Anagnostopoulos
Mr. Nicholas Manginas (photographer)
Greek Orthodox Patriarchate of Alexandria & All Africa:
His Eminence Petros, Metropolitan of’Axoum
Greek Orthodox Patriarchate of Jerusalem:
Archimandrite Theoktistos, Exarch of the Patriarchate of Jerusalem & Athens
Professor Spyridon Kontoyannis, Docent of the University of Athens
Patriarchate of Moscow:
His Eminence Kirill, Metropolitan of Smolensk & Kaliningrad & President of the Department of External Church Relations of the Patriarchate
Rev. Igor Vyzhanov, Deputy Secretary for Catholic Church Relations of the Department of External Church Relations
Ukrainian Orthodox Church (Patriarchate of Moscow):
His Eminence Mitrofan, Archbishop of Pereiaslav-Khmelnitsky & Delegate for External Affairs of the Ukrainian Orthodox Church (Patriarchate of Moscow)
Orthodox Church of Georgia:
His Eminence Daniel [Datuashvili], Metropolitan of Tskhum-Abkhazia
His Eminence Gerasime [Sharashenidze], Bishop of Zugdidi & Tsaishi & Delegate for Inter-Church Relations of the Orthodox Church of Georgia
Rev.Archpriest Giorgi Zviadadze
Orthodox Patriarchate of Serbia:
His Eminence Jovan, Metropolitan of Zagreb, Lubljana & All Italy
His Eminence Lavrentije, Bishop of Sabac-Valjevo
Orthodox Patriarchate of Romania:
His Eminence Daniel, Metropolitan of Moldavia & Bucovina
His Eminence Iosif, Metropolitan of Eastern & Southern Europe of the Orthodox Church of Romania
Rev.Monsignor Ciprian Campineanul, Assistant to the Patriarch
His Eminence Siluan, Assistant Bishop to the /metropolitan of Eastern & Southern Europe
Rev. Deacon Costin Spiridon, Office of Patriarchal Protocol
Orthodox Church of Finland:
His Eminence Leo, Archbishop of Karelia & All of Finland
Orthodox Church of Bulgaria:
His Eminence Neofit, Metropolitan of Russe
His Eminence Dometian, Metropolitan of Vidin
His Eminence Tihon, Episcopal Vicar of the Metropolia of the Bulgarian Orthodox Church for Europe
Rev. Deacon Dionissii
Orthodox Church of the Czech Lands & Slovakia:
Rev. Ladislav Bily, Chancellor of the Metropolitan Curia
Rev Jan Novak, Secretary of the Metropolitan Curia
Orthodox Church of Cyprus:
His Eminence Chrysostomos, Metropolitan of Paphos & Deputy to the Archbishop of Nea Justiniana in Cyprus
His Eminence Basilios, Assistant Bishop, Diocese of Trimithos
His Eminence Nikiphoros, Bishop of Kykko & Hegumen of the Holy Monastery of Kykko
Rev.Msgr Dyonisios Papachristophorou, Abbott of the Monastery of Chrysoroyatissa
Rev.Doctor Archimandrita Isaias, Holy Monastery of Kykko
Orthodox Church of Greece:
His Beatitude Christodoúlos, Archbishop of Athens & All of Greece
His Eminence Ignatios, Metropolitan of Demetrias & President of the Synodal Committee for Inter-Orthodox & Inter-Christian Relations
His Eminence Nectarios, Metropolitan of Corfu
His Eminence Dorotheos, Metropolitan of Syros
Rev.Doctor Protopresbyter Thomas Synodinos, Chancellor of the Archdiocese of Athens
Rev. Doctor Archimandrite Ignatios Sotiriadis, Secretary of the Synodal Commission for Inter-Christian Relations
Orthodox Church of Poland:
His Eminence Jeremiasz, Archbishop of Warsaw & Szczecin
Orthodox Church of Albania:
His Beatitude Anastas, Archbishop of Tirana & All Albania
Rev.Deacon Bakalbassi
Orthodox Church in America:
His Eminence Seraphim, Bishop of Ottawa
Rev. Doctor Alexander Rentel, Docent, St. Valdimirs Orthodox Theological Seminary
Coptic Orthodox Patriarchate of Egypt:
His Eminence Barnaba El-Soryany, Bishop for Orthodox Copts in Italy
Syrian Orthodox Patriarchate of Antioch & All the East:
His Eminence Mor Gregorios Yohanna Ibrahim, Archbishop of Aleppo
Armenian Apostolic Church - See of Etchmiadzin:
His Holiness Karekin II, Supreme Patriarch & Catholicos of All the Armenians
His Beatitude Mesrob II [Mutafian], Armenian Patriarch of Istanbul
His Eminence Khajag [Barsamian], Primate of the Eastern Diocese of the United States in New York
Rev. Doctor Presbyter Geghard Vahuni, Secretary to the Patriarch
Rev. Doctor Presbyter Tatul Anushian, Armenian Patriarcate of Istanbul
Catholicosate of Cilicia of the Armenians - See of Antelias:
His Holiness Aram I, Catholicos of Cilicia for the Armenians
His Eminence Bishop Nareg Alemezian, Deputy for Relations with the Catholic Church
Orthodox Church of Ethiopia:
His Holiness Abba Paulos, Patriarch of Ethiopia
His Eminence Abuna Dott. Timotheos [Habtselassie Tesfa], Archbishop & Rector of Holy Trinity Theological College
His Eminence Abuna Filipos [Gebremariam Feleke], Archbishop of Illubabor
Mr. Ato Mulgete Bekele
Orthodox Church of Eritrea:
His Eminence Abuna Shenouda, Bishop of the Eritrean Church in Europe
Assyrian Church of the East:
His Holiness Mar Dinkha IV, Catholicos & Patriarch of the Assyrian Church of the East
His Eminence Mar Bawai Ashur Soro, Bishop of the Eastern United States &
General Secretary of the Commission on Inter-Church Relations & Education Development