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The Monastery of Saint Thaddeus (Armenian: Սուրբ Թադէոսի վանք, Surb Tadeosi vank; Persian: کلیسای تادئوس مقدس, Kelisā-ye Tādeus moghadas) is an ancient Armenian monastery in the mountainous area of West Azerbaijan Province, Iran. It is believed to be one of the oldest church buildings in the world.