Mr. E. Waterton mentions a remarkable ring, set with fine opal, preserved at Mayence Cathedral, where it was found with an enamelled crosier in the tomb, as was supposed, of Archbishop Sigfroi III. (1249). [Illustration: Ring of Thierry, Bishop of Verdun.] In the Londesborough Collection is the ring of Thierry, Bishop of Verdun (who died in 1165), found in his tomb in 1829. It is of gold, with a sapphire, an irregular oval with five capsular marks on the face; the shank, two winged dragons, between the heads of which is the inscription AVE MARIA GRATIA. This ring was procured in exchange from the collection of M. Failly, Inspector of Customs, at Lyons in 1848. Mr. Octavius Morgan remarks: ‘It is difficult to reconcile the practice of returning the ring to the Emperor’ (to which I have in this chapter alluded) ‘with that of interring the bishop with his ring on his finger; but it is probable that, when in the twelfth century the Emperor ceded to the Popes the right of investiture by the ring the sending back the ring was dispensed with; and, being the property of the Church, and not of the Emperor, the bishop was allowed to be interred with his ring as an emblem of his dignity.’ The Rev. C. W. King remarks that the custom of burying ecclesiastics with all their official insignia appears to have lasted far down into the Middle Ages; for, amongst the amusing adventures of Andreuccio da Perugia, related by Boccaccio, he, when reduced to despair, joins some thieves in plundering the tomb of the Archbishop of Naples, interred the previous day in all his precious vestments, and with a ring on his finger valued at five hundred scudi. Two parties of plunderers, headed by a priest of the cathedral, visit the tomb in succession, and almost at the same time; to which circumstance Andreuccio owes his escape from a horrible death, and returns home in possession of the ring, which more than makes up for all his losses. The Rev. C. W. King considers it probable that this common practice of plundering the tombs, gave origin to the huge rings of gilt metal, which bear the titles, or coats of arms, of some pope or bishop. On the subject of pontifical rings of an ordinary character, I may observe that they are found in several collections, usually of brass or copper gilt. Benvenuto Cellini, in his ‘Memoirs,’ mentions a magnificent diamond as having been presented to Pope Paul the Third by the Emperor Charles the Fifth on his entry into Rome (1536), for which he was desired to make a ring, and succeeded in giving the diamond a tint which surpassed anything yet done. [Illustration: Ring of Pope Pius II.] In the collection of Thomas Windus, Esq., F.S.A., is a ring bearing the arms of Pope Pius II. of the family of Piccolomini, the Papal tiara, and inscription, ‘Papa Pio.’ The ring is of brass, thickly gilt; the stone topaz: on the sides are the four beasts of the ‘Revelation.’