The xiphos is a double-edged, single-hand sword used by the ancient Greeks. It was a secondary battlefield weapon for the Greek armies after the spear or javelin. The classic blade was generally about 50–60 cm long, although the Spartans supposedly started to use blades as short as 30 cm around the era of the Greco-Persian Wars. The xiphos sometimes has a midrib, or is diamond or lenticular in cross-section. It was generally hung from a baldric under the left arm.