Original: Examples of Old Persian have been found in present-day Iran , Iraq , Turkey and EgyptRoland G. Kent , Old Persian , 1953 the most important attestation by far being the contents of the Behistun inscription ( dated to 525 BCE ) .
Simplified: Examples of Old Persian have been found in present-day Iran , Iraq , Turkey and EgyptRoland G. Kent , Old Persian , 1953 [ ] .