Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Monasteries of Haghpat and Sanahin' has mentioned 'Middle Ages' in the following places:
Occurrence Sentence Text Source
Described as a "masterpiece of religious architecture and a major center of learning in the Middle Ages", Haghpat monastery, together with Sanahin Monastery, was placed on UNESCO's World Heritage List in 1996.