Brief synthesisThe two monastic complexes of Haghpat and Sanahin are a serial property situated in the Lori Marz (region) of Armenia. The approaches to it were observed from the Kayanberd Fortress, which was built in the 13th century especially for that purpose. The narthex of St Astvatsatsin Church (built in AD 1211) is unique in its plan of a three-nave rectangular hall. Criterion (ii): The monasteries of Sanahin and Haghpat are unique by virtue of their blending of elements of both Byzantine church architecture and traditional vernacular building styles of this region. Criterion (iv): The monasteries of Sanahin and Haghpat are outstanding examples of the ecclesiastical architecture that developed in Armenia from the 10th to the 13th century.