Languages of the Ottoman Empire
The language of the court and government of the Ottoman Empire was Ottoman Turkish, but many other languages were in contemporary use in parts of the empire. Although the minorities of the Ottoman Empire were free to use their language amongst themselves, if they needed to communicate with the government they had to use Ottoman Turkish.
Ioannina
Despite the repression and conversions in the 17th century, and the prominence of the Muslim population in the city's affairs, Ioannina retained its Christian majority throughout Ottoman rule, and the Greek language retained a dominant position; Turkish was spoken by the Ottoman officials and the garrison, and the Albanian inhabitants used Albanian, but the "lingua franca" and native language of most inhabitants was Greek, including among the "Tourkoyanniotes", and was sometimes used by the Ottoman authorities themselves.