How was Persian empire organized?

The kingdom was headed by a king and his council. Provinces (satrapies) were ruled by a Persian Satrap (governor) who was responsible for internal security, border security and collecting taxes. Within the provinces local government remained. A lingua franca (Aramaic) provided communcication across the empire and its many local languages. Security forces were local levies and ruling forces under command of the satraps and the king. A system of roads and ships provided intercommunication.