The ' Royal Scythians ' ruled the ' nomad Scythians ' and groups of ' farmer Scythians ' who probably sold grain to the Greek cities .
About 513 Darius I invaded Scythia , could not catch the Scythians and withdrew .
The ' Scythia   ' ruled the ' nomad Scythia ' and groups of ' farmer Scythia ' who probably sold grain to the Greek cities .
About 513 Darius I invaded Scythia , could not catch the Scythians and withdrew .