Preserved interstate treaties and other documents from the 12th century provide enough data to conclude that the authorities would already at that time oversee the work of the public notary and the chancellery. Based on key provisions made during the 15th century, the central administration consisted of five offices located in the Rector's Palace and these were: The Public Notary (legal private affairs), the State Chancellery (legal public affairs), the Judicial Chancellery (criminal justice affairs), the Office of the State Secretary (legal state affairs) and the Slavic Chancellery, which would be transformed later into the Turkish Chancellery.