Matenadaran Institute of Ancient Manuscripts Matenadaran named after St. Mesrop Mashtots is a Yerevan research center under the Government of the Republic of Armenia, which is one of the largest repositories of manuscripts in the world and the largest repository of ancient Armenian manuscripts. The institute has a museum open to visitors. The complex consists of two buildings: the main one (built in 1959 and completely renovated in 2012) and the new one (built in 2011).