Flavius Vegetius[26], writing at the close of the fourth century A.D., distinguishes six kinds of military insignia, viz.: aquila, draco, vexillum, flammula, tufa and pinna. The _Draco_ or dragon had been borrowed from the Parthians after the death of Trajan. It took the form of a dragon fixed upon a lance with gaping jaws of silver. The body was of coloured silk, and when the wind blew down the open jaws the body was inflated. The _Flammula_ (little flame) was an elongated flag attached to the staff at the side, split throughout its length so as to form two narrow streamers. The _Tufa_ seems, from the name, to have been some form of tuft[27] or helmet-crest, but the exact form is not known. It is of interest as having been adopted in Britain under the name _Tuuf_[28]. _Pinnae_ was the name given to the side wings of the soldiers' helmets, apparently formed of feathers. The precise form of the _pinna_ standard is not known, but it is probable that the fan-shaped feather standards which are displayed at the coronation of the pope are a survival of this, or the preceding form. Until the end of the Roman Empire the standard was used at sea only for signalling purposes or to mark the ship in which the leader was embarked. Thus in the action off Marseilles in B.C. 49, in which Caesar's fleet under the command of Brutus engaged the Massilian fleet which was fighting on the side of Pompey, the ship in which Brutus was embarked was quickly recognised by the leader's standard, and narrowly escaped being rammed by two triremes from opposite sides[29]. There are frequent references to this standard in classical writers and it is often depicted in reliefs or on coins. From these it is clear that its position was on the starboard quarter of the ship, at the leader's right hand; it was raised there in going into action, and its removal was a sign of disaster or retreat. It would seem that it was also removed if the fleet was about to be engaged by superior forces, presumably in order that the enemy might not concentrate against the leader's ship. Thus in B.C. 36 Octavian, when expecting an attack at sea by Pompey, embarked in a liburnian and sailed round the fleet exhorting his men to have courage. When he had done this he lowered his standard "as is the custom in times of very great danger[30]."