Dayro d-Mor Mattai (;The Monastery of St. Matthew, Arabic,دير مار متى) is located atop Mount Alfaf in northern Iraq and is 20 kilometers from Mosul. It is recognized as one of the oldest Christian monasteries in existence and is famous for its magnificent library and considerable collection of Syriac Christian manuscripts. It is also the center of an Archbishopric, with Bishop Mor Timothius Mousa A. Shamani serving.