 Herodotus has documented that the Qedarites were called upon to assist <unk> II of the Persian empire in his invasion of Egypt in 525 BCE . The Qedarites and <unk> were known to enjoy close relations , even engaging as wartime allies against the Assyrians . It is possible that the Qedarites were eventually incorporated into the <unk> state which emerged as the strongest <unk> presence in northwestern Arabia c. the 2nd century CE . In The Cambridge Ancient History , some of the ( Arab ) <unk> mentioned by <unk> in his retelling of events that took place in 312 BCE are said to be Qedarites . 
