According to Tacitus, Calgacus (sometimes Calgacos or Galgacus) was a chieftain of the Caledonian Confederacy who fought the Roman army of Gnaeus Julius Agricola at the Battle of Mons Graupius in northern Scotland in AD 83 or 84. His name can be as interpreted as Celtic *calg-ac-os, "possessing a blade" or "possessing a penis". The only historical source that features him's Tacitus' Agricola, which describes him as "the most distinguished for birth and valour among the chieftains". Tacitus wrote… (More on Calgacus)