There is an extremely interesting manuscript in the British Museum called the _Comentario Apocaliptica_, said to have been executed between 1089 and 1109. It is frequently referred to by Hewitt, and throws much light on the armour of the period. We have reason to be grateful for the absurd practice persisted in by ancient illuminators and painters of depicting persons, supposed to have lived in Greek and Roman times, in the costume of their own day. One of the illuminations shows four knights mounted. They wear long coats of mail, reaching below the knees, with sleeves, which, in two cases, reach only to the elbows. In one case the coat of mail is shown as composed of blue scales, with red studs, and here we seem to have an instance of jazerine armour (from the Italian _ghiazerino_). It seems clear that the designer did not mean to represent chain-mail in this way, for when the body of the garment is obviously of mail he has taken care to distinguish a different pattern on the chausses or leg armour. Still in this class of illustration it is always a moot point what kind of armour the artist actually did mean to represent. Possibly a shirt of chain-mail was sometimes worn, with stockings of leather set with scales of metal, as more flexible and allowing greater freedom to the limbs. The shirts of mail are edged with wide borders, which may or may not represent the under tunic or gambeson showing beneath. On fol. 194, we have the full-length picture of a warrior armed _cap-à-pie_. He wears a long hauberk of mail, chausses or leg-armour of the same material, and a conical helmet, with a “nasal” or nose-protector, exactly the same as that worn by William the Conqueror and his knights. Hewitt calls attention to the knop, or button, surmounting the helmet, as a peculiarity. The knight is armed with sword and spears, and, like the four others just mentioned, carries a circular target. This is a noteworthy detail, as kite-shaped shields were almost universally in vogue at this epoch, over the rest of Europe. That they were to some extent in use in Spain also, is attested by the specimen (O59) in the Armoury.