Since 1867 Aghayan managed the Ararat monthly of Mother See of Holy Etchmiadzin.
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The Komitas medal by His Holiness Vazgen I, Surpreme Patriarch and Catholicos of All Armenians of the Mother See of Holy Etchmiadzin of the Armenian Apostolic Church
In 1999 he was elected Catholicos of All Armenians at the Mother See of Holy Etchmiadzin, succeeding Karekin I.