The helmet, at the beginning of the period, was like the old Saxon conical helmet, with a nasal; and this continued in occasional use far into the fourteenth century. About the end of the twelfth century, the cylindrical helmet of iron enclosing the whole head, with horizontal slits for vision, came into fashion. Richard I. is represented in one on his second great seal. A still later fashion is seen in the next woodcut, p. 334. William Longespée, A.D. 1227, has a flat-topped helmet. The only two inventions of the time seem to be, first, the surcoat, which began to be worn over the hauberk about the end of the twelfth century. The seal of King John is the first of the series of great seals in which we see it introduced. It seems to have been of linen or silk. The other great invention of this period was that of armorial bearings, properly so called. Devices painted upon the shield were common in classical times. They are found ordinarily on the shields in the Bayeux tapestry, and were habitually used by the Norman knights. In the Bayeux tapestry they seem to be fanciful or merely decorative; later they were symbolical or significant. But it was only towards the close of the twelfth century that each knight assumed a fixed device, which was exclusively appropriated to him, by which he was known, and which became hereditary in his family. The offensive weapons used by the knights were most commonly the sword and spear. The axe and mace are found, but rarely. The artillery consisted of the crossbow, which was the most formidable missile in use, and the long bow, which, however, was not yet the great arm of the English yeomanry which it became at a later period; but these were hardly the weapons of knights and gentlemen, though men-at-arms were frequently armed with the crossbow, and archers were occasionally mounted. The sling was sometimes used, as were other very rude weapons, by the half-armed crowd who were often included in the ranks of mediæval armies. We have said that there is a great scarcity of pictorial representations of the military costume of the thirteenth century, and of the few which exist the majority are so vague in their definition of details, that they add nothing to our knowledge of costume, and have so little of dramatic character, as to throw no light on manners and customs. Among the best are some knightly figures in the Harleian Roll, folio 6, which contains a life of St. Guthlac of about the end of the twelfth century. The figures are armed in short-sleeved and hooded hauberk; flat-topped iron helmet, some with, some without, the nasal; heater-shaped shield and spear; the legs undefended, except by boots like those of the Goliath on p. 322.