Ottoman envoys assigned by the sultan to carry out specific diplomatic activities were evaluating their missions in the reports called Sefaretname (Diplomatic Letters). Diplomatic letters were rich sources for the Ottoman diplomacy and diplomatic missions. The number of these diplomatic letters were about forty and the oldest diplomatic letter belongs to Kara Mehmet Pasha sent to Vienna to ameliorate relations between the empire and Austria after Vasvar Treaty had been signed in 1664. There were two types of diplomatic letters: special ones and general ones. Special diplomatic letters were only about the developments and results of the mission carried out by the envoy. On the other hand, in general diplomatic letters, Ottoman envoys were describing social life, military power, culture, education, industry and development level of the receiving country.