The Xerxes' Sacrifice of the Nine was a site within Roots of an Empire, the easternmost region of Makedonia, west of Amphipolis. There the King Xerxes I of Persia buried nine young men and nine young women alive, as well as sacrificed white horses before crossing the Strymon river with his army.
By the late 5th century BCE, the site was claimed as a campsite by a detachment of Followers of Ares. During the Peloponnesian War the site was visited by the Spartan misthios Kassandra, who eliminated their chief and claimed their valuables.
After the Order of Hunters, a branch of the Order of the Ancients, infiltrated Greece, Konon the Fighter joined the Followers of Ares and made the ruins his base of operations. When Kassandra learned of the Order, she sought out Konon and slew him.
- The name of the place references save for the number of the sacrificed boys and girls, also the Thracian settlement of Ennea-Hodoi (meaning Nine Ways/Roads), upon which Amphipolis was built. It was also whence Xerxes gathered the boys and girls to be sacrificed.