 It appears from Herodotus to have been a little to the right of the route of the army of Xerxes I took in its invasion of Greece in the Greco-Persian Wars, and must therefore have been situated a little inland.Its territory must have been extended as far as the right bank of the Strymon, since Cerdylium, the mountain immediately opposite Amphipolis, belonged to Argilus.It was a member of the Delian League.