On 1st July 1970, according to the Synod's decision he was ordained Deacon in the Holy Golgotha by His Eminence Archbishop Vasilios of Jordan, and served in the Holy Church of the Resurrection.
Later, he served as the Patriarch's Deacon. On 1st July 1975, he was ordained Priest by His Eminence Diodoros, Archbishop of Hierapolis, at the Holy Golgotha. According to the Synod's decision (27-02-1975) he was sent to Athens for higher education at the Theological faculty. On 21st February 1978 he was bestowed the office of Archimandrite. Having completed his studies, he returned to Jerusalem and was appointed Chief Secretary of the Secretariat of the Patriarchate, as well as teacher at the Patriarchal School, and supervisor at the holy monastery of St. Haralambos (12-10-1979). On 02-05-1981 he was elected member of the overseeing committee of the magazine “New Sion”.
On 22-12-1981 he was sent to England to receive post-graduate education at Durham University. After his successful studies he returned and was appointed Secretary of the Holy and Sacred Synod (12-08-1986), responsible for the Office of Press and Information of the Patriarchate, as well as member of the School Board.
On 31-10-1986 he was sent as a representative of the Patriarchate to the Central Committee of the World Council of Churches and took part in the 7th General Assembly of W.C.C. in Canberra, Australia. From 1991 to 1996 he served as Abbot at Kana. In 1997 he was a member of the Judicial Committee and in the same year he was sent to Qatar.
On 27-09-2000 he was elected member of the Holy and Sacred Synod. In September 2001 he was elected Patriarchal Commissioner in Moscow. In July 2003 he was reappointed as the person in charge in Qatar. On 08-06-2004 he was nominated member of the Ecclesiastical Court and in September of the same year he was appointed Elder Sacristan of the Holy Church of the Resurrection. On 14-02-2005 he was elected and ordained Archbishop of Thabor.
On 9/22-08-2005 he was unanimously elected by the Holy and Sacred Synod, Patriarch of the ancient Patriarchate of Jerusalem. His enthronement took place on 9th /22nd November 2005 at the Holy Church of the Resurrection, in the presence of representatives from all the Orthodox Churches, as well as from the Jordanian Government and the Palestinian Authority, and by His Excellency Papoulias, the President of Republic of Greece, and the Representative of the Emir of Qatar.
After His enthronement His Beatitude Theofilos III, beyond his active work in all the areas for the restoration of the smooth operation of the Patriarchate and the improvement in the spiritual life of its Flock, as well as for the proprietary stability of the Holy Shrines also took care to enhance the participation of the Church of Jerusalem in the inter-orthodox and inter-faith proceedings in order to guard both the ecclesiastical order and the Holy Canons of the Church, and strengthening the international rights and the role of the Church of Jerusalem. So, he took part in the divided Synod, concerning the succession in the throne of the Cypriot Church, at Sambezi, in Geneva, in 2006. In the same month he went to the Ecumenical Patriarchate of Constantinople on a Peace Mission. He reconfirmed the participation of the Jerusalem Patriarchate even by His presence at the “World Council of Churches” and the “Council of Churches in the Middle East”.
In October 2007, at the invitation by the Government of the U.S.A., he took part in the Washington D.C. “Council of Religious Institutions of the Holy Land” in order to advance the political reconciliation process in the Holy Land.
Among His many other concerns, he took care to elaborate on accepted historical studies and translations on the history of the Church of Jerusalem. He took part as a Lecturer in scientific seminars and conferences in Jerusalem and in Greece.
In September 2008, at the invitation by the European Parliament, His Beatitude Theofilos III went to Brussels where he presented the framework and the problems of the Church of the Holy Land, known by the Officials of the European Community and the European Council.
In October he took part in the Synod of the Primus of all the Orthodox Churches at the Ecumenical Patriarchate of Constantinople.
In 2009 he took part in the Conference held in London «The C-1 World Dialogue
», where he was appointed Vice-President.
His Beatitude, the Patriarch of the Holy City of Jerusalem and all Palestine, Syria, Arabia, and beyond the Jordan River, Kana of Galilee and Holy Sion, Theophilos III
Date of election, 9th /22nd August 2005
Date of enthronement, 9th /22nd November 2005
Private Office of the Patriarch.