Cast from lead for use in a sling, the diamond shaped bullet is bi-conical on one side and flat on the other marked with the roman numerals LXIII marking it as ammunition for a member of the thirteenth legion. Originally founded by Julius Caesar in 57 B.C. this legion was in use until it was disbanded in 45 B.C.. During this time they took part in such conflicts as the Gaelic Wars as well as fighting on the side of Caesar during his battle with Pompey and the Senate. It was then reconstituted by Augustus in 41 B.C. as the Legio XIII Gemina (or the 13th Twin Legion) and was in use until the fifth century A.D.