Around 510 BC Persians under the rule of Darius the Great moved the inhabitants of the Greek colony of Barca in Libya into Bactria. Later, Xerxes I also settled there the "Branchidae" who were the descendants of Greek priests who had once lived at Didyma. Herodotus also records Persian generals threatening to enslave daughters of the revolting Ionians and send them to Bactria if they didn't stop fighting.