EXPEDITIO. - Whenever the memorial of an emperor 's expedition against the enemy is struck on a coin, he is made to appear in haste. Thus Septimius Severus is seen represented on horseback, galloping with couched spear, on a silver coin, which is referred by Vaillant to that emperor 's campaign in Britain. But the departure of the emperor on a pacific journey (according to the same author) is depicted on coins by a horseman going at a moderate pace. The subjoined type of Hadrian would, with the aid of the legend, signify a setting out; but the slow pace of the horse rather denotes the adventus, or arrival.