The xiphos (Ancient Greek: ξίφος [ksípʰos]; plural xiphe, Ancient Greek: ξίφη [ksípʰɛː]) is a double-edged, one-handed Iron Age straight shortsword used by the ancient Greeks. It was a secondary battlefield weapon for the Greek armies after the dory or javelin. The classic blade was generally about 45–60 cm (18–24 in) long, although the Spartans supposedly preferred to use blades as short as 30 cm (12 in) around the era of the Greco-Persian Wars.
Gladius (Classical Latin: [ˈɡɫadiʊs]) is a Latin word properly referring to the type of sword that was used by ancient Roman foot soldiers starting from the 3rd century BC and until the 3rd century AD. Linguistically, within Latin, the word also came to mean "sword", regardless of the type used.
Early ancient Roman swords were similar to those of the Greeks, called xiphe (pl., sg.: xiphos). From the 3rd century BC, however, the Romans adopted a weapon based on the sword of the Celtiberians of Hispania in service to Carthage during the Punic Wars, known in Latin as the gladius hispaniensis, meaning "Hispanic-type sword". The Romans improved the weapon and modified it depending on how their battle units waged war, and created over time new types of "gladii" such as the Mainz gladius and the Pompeii gladius. Finally, in the third century AD the heavy Roman infantry replaced the gladius with the spatha (already common among Roman cavalrymen), relegating the gladius as a weapon for light Roman infantry.