St. Gregory the Illuminator Cathedral in Yerevan was built in 1996-2001. The architect is Stepan Kyurkchyan. The construction was carried out by the idea of the Blessed His Holiness Vasken I, Catholicos of All Armenians.
On April 7, 1997, the Feast of the Annunciation to the Virgin Mary, under the chairmanship of His Holiness Karekin II, Catholicos of All Armenians; the ground-blessing service was held.
The consecration of the church was held on September 23, 2001, by His Holiness Karekin II, Supreme Patriarch and Catholicos of All Armenians. The relics of Saint Gregory the Illuminator brought from the Church of Saint Gregory of Armenia in Naples in 2000 are kept in the vestibule of the church.
The church was built with the donation of Richard Manookian and Louise Manookian-Simone in memory of their late parents, Alex and Marie Manookian. The construction of the two chapels was carried out by the donation of Mr. and Mrs. Nazar and Artemis Nazaryan and Mr. and Mrs. Gevorg and Linda Gevorgyan, and the bell tower by Mr. Eduardo Eurnekian.
Currently, due to the major renovation of the Mother Cathedral, Patriarchal liturgies, ordinations and other church ceremonies are performed in St. Gregory the Illuminator Cathedral in Yerevan.
The St. Gregory the Illuminator Cathedral in Yerevan is under the jurisdiction of the Mother See of Holy Etchmiadzin.
Under the high authority of His Holiness Karekin II, Supreme Patriarch and Catholicos of All Armenians; the Spiritual Dean of the St. Gregory the Illuminator Cathedral is His Grace Bishop Anoushavan Zhamkochian.