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 under Abelard and became a cardinal priest. Elected the successor of Innocent II. on the 26th of September 1143, he died on the 8th of March following. He removed the interdict which Innocent had employed against Louis VII. of France. At the time of his death he was on the verge of a controversy with Roger of Sicily.

III. (Giacinto Bobo), pope from 1191 to 1198, was cardinal deacon of Santa Maria in Cosmedin as early as 1144, and had reached the age of eighty-five when chosen on the 30th of March 1191 to succeed Clement III. The first pope of the house of the Orsini, his policy was marked by mildness and indecision. Henry VI. of Germany at once forced the pontiff to crown him emperor, and three or four years later took possession of the Norman kingdom of Sicily; he refused tribute and the oath of allegiance, and even appointed bishops subject to his own jurisdiction; moreover, he gave his brother in fief the estates which had belonged to the countess Matilda of Tuscany. Celestine did not dare so much as to threaten him with excommunication. It was Celestine’s purpose to lay England under the interdict; but Prince John and the barons still refused to recognize the papal legate, the bishop of Ely. Richard I. had been set free before the dilatory pope put Leopold of Austria under the ban. In his last sickness Celestine wished to resign his office, but the cardinals protested. Death released him from his perplexities on the 8th of January 1198.

IV. (Godfrey Castiglione), pope in 1241, son of a sister of Urban III. (1185–1187), was archpriest and chancellor at Milan. After Urban’s death he entered the Cistercian monastery at Hautecombe in Savoy. In 1227 Gregory IX. created him cardinal priest of St Mark’s, and in 1233 made him cardinal bishop of Sabina. Elected to succeed Gregory on the 25th of October 1241, he died on the 10th of November, before consecration, and was buried in St Peter’s.

V. (St Peter Celestine), pope in 1294, was born of poor parents at Isernia about 1215, and early entered the Benedictine order. Living as a hermit on Monte Morrone near Sulmone in the Abruzzi, he attracted other ascetics about him and organized them into a congregation of the Benedictines which was later called the (q.v.). The assistance of a vicar enabled him to escape from the growing administrative cares and devote himself solely to asceticism, apparently the only field of human activity in which he excelled. His Opuscula, published by Telera at Naples in 1640, are probably not genuine; he was indoctus libris. A fight between the Colonna and the Orsini, as well as hopeless dissensions among the cardinals, prevented a papal election for two years and three months after the death of Nicholas IV. Charles II. of Naples, needing a pope in order that he might regain Sicily, brought about a conclave. As the election of any cardinal seemed impossible, on the 5th of July 1294 the Sacred College united on Pietro di Morrone; the cardinals expected to rule in the name of the celebrated but incapable ascetic. Apocalyptic notions then current doubtless aided his election, for Joachim of Floris and his school looked to monasticism to furnish deliverance to the church and to the world. Multitudes came to Celestine’s coronation at Aquila, and he began his reign the idol of visionaries, of extremists and of the populace. But the pope was in the power of Charles II. of Naples, and became his tool against Aragon. The king’s son Louis, a layman of twenty-one, was made archbishop of Lyons. The cardinals, scarcely consulted at all, were discontented. The pope, who wanted more time for his devotions, offered to leave three cardinals in charge of affairs; but his proposition was rejected. He then wished to abdicate, and at length Benedetto Gaetano, destined to succeed him as Boniface VIII., removed all scruples against this unheard-of procedure by finding a precedent in the case of Clement I. Celestine abdicated on the 13th of December 1294. There is no sufficient ground for finding an allusion to this act in the noted line of Dante, “Che fece per viltate il gran rifiuto” (“who made from cowardice the great refusal,” Inferno, 3, 60). Boniface at length put him in prison for safe keeping; he died in a monastic cell in the castle of Fumone near Anagni on the 19th of May 1296. He was canonized by Clement V. in 1313.

 CELESTINE, or, a name applied to native strontium sulphate (SrSO4), having been suggested by the celestial blue colour which it occasionally presents. This colour has been referred to a trace of iron phosphate, but in some cases such an explanation appears doubtful. The mineral is usually colourless, or has only a delicate shade of blue. Celestine crystallizes in the orthorhombic system, being isomorphous with (q.v.). The angle between the prism faces is 76° 17′. The cleavage is perfect parallel to the basal pinacoid, and less marked parallel to the prism. Although celestine much resembles barytes in its physical properties, having for example the same degree of hardness (3), it is less dense, its specific gravity being 3.9. Celestine is a less abundant mineral than barytes. It is, however, much more soluble, and occurs frequently in mineral waters. W. W. Stoddart showed that many plants growing on Keuper marls containing celestine near Bristol appropriated the strontium salt, and the metal could be detected spectroscopically in their ashes.

Celestine occurs in the Triassic rocks of Britain, especially in veins and geodes in the Keuper marl in the neighbourhood of Bristol. At Wickwar and Yate in Gloucestershire it is worked for industrial purposes. Colourless crystals, of great beauty, occur in association with calcite and native sulphur in the sulphur deposits of Sicily, as at Girgenti. Fine blue crystals are yielded by the copper mines of Herrengrund, in Hungary; a dark blue fibrous form is known from Jena; and small crystals occur in flint at Meudon near Paris. Very large tabular crystals are found in limestone on Strontian Island in Lake Erie; and a blue fibrous variety from near Frankstown, Blair Co., Penn., is notable as having been the original celestine on which the species was founded by A. G. Werner in 1798.

Celestine is much used for the preparation of strontium hydrate, which is employed in refining beetroot sugar in Germany. The mineral is used also as a source of various salts of strontium such as the nitrate, which finds application in pyrotechny for the production of red fire.  CELESTINES, a religious order founded about 1260 by Peter of Morrone, afterwards Pope Celestine V. (1294). It was an attempt to unite the eremitical and cenobitical modes of life. Peter’s first disciples lived as hermits on Mount Majella in the Abruzzi. The Benedictine rule was taken as the basis of the life, but was supplemented by regulations notably increasing the austerities practised. The form of government was borrowed largely from those prevailing in the mendicant orders. Indeed, though the Celestines are reckoned as a branch of the Benedictines, there is little in common between them. For all that, St Celestine, during his brief tenure of the papacy, tried to spread his ideas among the Benedictines, and induced the monks of Monte Cassino to adopt his idea of the monastic life instead of St Benedict’s; for this purpose fifty Celestine monks were introduced into Monte Cassino, but on Celestine’s abdication of the papacy the project fortunately was at once abandoned. During the founder’s lifetime the order spread rapidly, and eventually