Article: From the 9th to 11th century, Armenian architecture underwent a revival under the patronage of the Bagratid Dynasty with a great deal of building done in the area of Lake Van, this included both traditional styles and new innovations. Ornately carved Armenian Khachkars were developed during this time. Many new cities and churches were built during this time, including a new capital at Lake Van and a new Cathedral on Akdamar Island to match. The Cathedral of Ani was also completed during this dynasty. It was during this time that the first major monasteries, such as Haghpat and Haritchavank were built. This period was ended by the Seljuk invasion.

Now answer this question: When was there an Armenian architecture revival?
From the 9th to 11th century