The following era was marked by instability, as over 1.5 million propertyless Greek refugees from Turkey had to be integrated into Greek society. Cappadocian Greeks, Pontian Greeks, and non-Greek followers of Greek Orthodoxy were all subject to the exchange as well. Some of the refugees could not speak the language and were from what had been unfamiliar environments to mainland Greeks, such as in the case of the Cappadocians and non-Greeks. The refugees also made a dramatic post-war population boost, as the number of refugees was more than a quarter of Greece's prior population.