The word crest appears to be derived from the Latin _crista_, the comb or tuft which grows upon the heads of many species of birds. The idea, as well as the name, was doubtless borrowed from this source. The crest was sometimes called a COGNIZANCE from cognosco, because by its means the wearer was _known_ or distinguished on the field of battle. Crests were originally worn by military commanders upon the apices of their helmets as the proud distinction of their rank; and, by adding to their apparent stature, served to give them a formidable aspect. They also enabled their soldiers to rally round their persons, and to follow their movements in the confusion of the battle. The tall plumes of birds, human heads, and figures of animals in a rampant posture, seem to have been among the earliest devices made use of. The antiquity of crests for the uses above referred to, is far greater than that of the introduction of heraldry. The helmets of the divinities and heroes of the classical era are thus decorated. The owl on that of Minerva may be cited as an example. Jupiter Ammon is represented as having borne, as a crest, a ram's head, which Alexander the Great adopted in token of his pretended descent from that deity. The use of crests by antient warriors is alluded to by Phædrus in his fable of the battle of the mice and weasels, where the generals of the former party are represented as wearing horns fastened to their heads: "Ut conspicuum in prælio Haberent signum quod sequerentur milites." _Fab. LIII._ In heraldry, the adoption of crests is modern compared with that of coat-armour,[168] and many families at the present time have no crests. This is easily accounted for. We have seen that they were at first used exclusively by commanders. In time, however, the spirit of imitation led persons of inferior rank to assume those of their feudal superiors; and hence far less regularity is found in the heraldry of crests than in that of coat-armour. In many cases crests have been borrowed from one or other of the charges of the shield: hence if the coat contain a lion rampant, the crest is frequently a demi, or half lion, or a lion's head; and should three or six eagles occupy the shield, another eagle often serves as a crest. With respect to the material of which the actual crests were composed, some assert that it was leather, or pasteboard stiffened and varnished, to preserve it from the wet; but the few that I have had an opportunity of inspecting are composed of more substantial materials. Thus the crest of one of the Echingham family, 'a demi-lion rampant,' on a helmet preserved in Echingham church, co. Sussex, is of wood, and that of a knight of the Pelham family in Laughton church, in the same county, 'a peacock in his pride,' is of iron. The crests engraved at the head of this chapter have been selected on account of their singularity.[169]