This paper compares two areas of Egypt and Khorāsān in post-Islamic era regarding the loss and maintenance of their mother tongues. While in Egypt, Coptic was gradually removed from both formal and colloquial usages, in Khorāsān, Persian (Farsi or Parsi Dari), though was out of official and governmental services for more than two centuries, was able to finally maintain its status. The most important reason found behind this difference can be attributed to the independence seeking movements in Khorāsān (e.g. Sho’ūbieh), leading to the establishment of the first post-Islamic independent Iranian governments who supported the revival of Iranian culture and the maintenance of Persian language. Secondly, the migration of Arab tribes and the Arabization of the conquered societies were more successful in Egypt compared to Eastern Iran, which changed the demographic composition of Egypt. Moreover, the role of Persian-speaking epic poets, the social class of dihgāns in Iranian society and the fact that Coptic was not as old a language as Persian are other important reasons. It is argued that language maintenance can happen better in cases where top–down governmental and institutional support exists.

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