By: Mir M.Hosseini
Dariush the great added Egypt to the Persian realm as one of Persia's 30 provinces or Satrap. Like other provinces his inscription is still available in Egypt. The world's first postal services were founded at his time to facilitate communication among diverse points within the vast Persian empire. A royal road was also built that created a safe passage for armies, caravans and couriers. Rest areas were also provided. For critical points a system of towers were built at the distance were one could hear another shouting loudly; this was meant to transmit important news such as incoming attacks mouth to mouth.