In addition to this service uniform there was, as Arrian’s description shows, a sort of parade uniform in which the mail shirts were replaced by brightly coloured tunics, and lighter shields and spears were carried than those used in war.[390] It was with this uniform and on ceremonial occasions that some of the soldiers wore those curious helmets with a mask decorating the face of which several specimens have been found.[391] The fine scale armour which has been found at Newstead and elsewhere probably also formed part of this parade uniform. It is, indeed, always worn by the Praetorians on the Marcus column, but the auxilia still appear in chain-mail as on the column of Trajan.[392] Specially elaborate suits of this armour were, however, worn by the regiments of catafractarii who appear in the army list in the second century.[393] The last change which we can trace was the alteration of the shape of the shield from oval to round, which probably took place in the third century. An _eques_ of the Cohors I Thracum is represented on a Danubian sepulchral monument with a shield of this form,[394] and the contemporary reliefs on the arch of Constantine show that it was practically universal a century later. The equipment described above was worn by the majority of the auxiliary cavalry, but it was by no means universal. The horse archers, if one may judge by a soldier of the Ala I Augusta Ituraeorum represented on a Danubian relief, carried no shield, and possibly no body armour, and wore a leather cap in place of a helmet.[395] Arrian also mentions that some regiments carried a specially heavy spear (κοντός), and devoted themselves to shock tactics.[396] The _numeri_, too, did not adopt the Roman uniform, but kept to their own dress and weapons. The Moors of Lusius Quietus are represented on the column wearing nothing but a short tunic; their weapons consist of a spear and a small round buckler (_cetra_), and they ride their horses without saddle or bridle, guiding them simply by a halter round the neck.[397] The regiments of Sarmatae enrolled by Marcus also presumably wore their national costume, which is perhaps represented in a fragmentary relief in the Chester Museum.[398]