The _allerion_ is a fabulous bird without either beak or legs, described by some writers as very small, like a martlet, while others give him the size of an eagle. The name is derived from the circumstance of his being destitute of all his extremities except the wings (ailles). Three such birds, according to the chroniclers of the middle ages, were shot with an arrow from a tower, by Godfrey of Boulogne, duke of Lorraine, at the siege of Jerusalem, during the first crusade; and three allerions upon a bend, in honour of that event, are borne as the arms of the duchy of Lorraine to this day.[118] The _chimera_ is, to use the words of Bossewell, "a beaste or monstre hauing thre heades, one like a Lyon, an other like a Goate, the third like a Dragon."[119] The _cockatrice_[120] is a cock, with the wings and tail of a dragon. The best account of him is given by Leigh: "Thys though he be but at ye most a foote of length yet is he kyng of all serpentes[121] of whome they are most afrayde and flee from. For with his breath and sight he sleath all thynges that comme within a speare's length of him. He infecteth the water that he commeth neare. His enemy is the wesell, who when he goeth to fight with y{e} cockatrice eateth the herbe commonlye called Rewe, and so in fight byting him he dyeth and the wesell therewith dyeth also. And though the cockatrice be veneme withoute remedye whilest he liueth, yet when he is dead and burnt to ashes, he loseth all his malice, and the ashes of him are good for alkumistes, and namely, in turnyng and chaungeyng of mettall." To this latter remark he adds, "I have not seene the proofe thereof, and yet I have been one of Jeber's cokes."