The usual form of helmet in the twelfth century is the cup-shaped headpiece of which the Cervellière is a typical example (Fig. 7). It was either worn as the sole defence or was used in conjunction with the helm as an under-cap. The wide-rimmed hat of iron is found all through the period of defensive armour with which we deal. It appears in the thirteenth century (Fig. 8) and is also to be found in the fifteenth. There is an example of one of these war-hats (_Eisenhut_) in the museum at Nuremberg. [Illustration: FIG. 6. Detail from the brass of Sir Roger de Trumpington, Trumpington, Camb., 1290.] [Illustration: FIG. 7. From the monument to Johan le Botiler, St. Bride's, Glamorganshire, 1300.] [Illustration: FIG. 8. Add. MS. 11. 639, f. 520, thirteenth century.] The Shield at the time of the Conquest was kite-shaped. It was long enough to cover the body and legs of the warrior when mounted, but it must have been a most inconvenient adjunct to his accoutrements. As we have seen in the Monk of St. Gall's records, the shield was sometimes made of iron; but the more usual material was wood covered with leather or the tough cuirbouilli. Its broad flat surface was from the earliest times used by the painter to display his art, which at first was not systematized, but consisted of geometrical patterns and strange birds and beasts that had no special meaning. As time went on each knight retained the device which was borne upon his shield and came to be recognized by it, and from this sprung the complicated science of Heraldry, which has survived, with all its intricate detail, to the present day. The surface of the shield was often bowed so that it embraced the body of the wearer. That some must have been flat we may suppose from the fact that the soldiers in the Bayeux Tapestry are represented as using them for trays to carry cups and plates at the 'Prandium'. In St. Lucy's Chapel, at Christ Church Cathedral in Oxford, in the window depicting the martyrdom of St. Thomas of Canterbury, are to be seen two varieties of decorated shields. Two of the knights bear shields painted with geometrical designs, while Fitz Urse carries a shield on which are three bears' heads erased, a punning cognizance from the name of the wearer. The date of the window is about the end of the thirteenth century. The shield was attached to the wearer by a thong passing round the neck, called the Guige. When not in use it was slung by this thong on the back. When in use the arm and hand passed through the short loops called Enarmes (Fig. 10). The Royal blazon first appears on the shield in the reign of Richard I. Occasionally we find circular shields depicted in illuminations; but they were generally used by the foot-soldiers. As the development of defensive armour proceeds we shall find that the shield becomes smaller, and in time is discarded, the body defences being made sufficient protection in themselves.