The renovation works were interrupted by the Ottoman-Safavid War of 1635–36, during which the cathedral remained intact. The renovations resumed under Catholicos Pilippos (1632–55), who built new cells for monks and renovated the roof. During this century, belfries were added to many Armenian churches. In 1653–54, he started the construction of the belfry in the western wing of Etchmiadzin Cathedral. It was completed in 1658 by Catholicos Hakob IV Jugayetsi. According to Hewsen the bell is of Tibetian origin with a Buddhist inscription, "probably the long-forgotten gift of some Mongol or Ilkhanid khan." Decades later, in 1682, Catholicos Yeghiazar constructed smaller bell towers with red tufa turrets on the southern, eastern, and northern wings.