The History of the Decline and Fall of the Roman Empire - Edward Gibbon [1781]
Ignis Groecus. Observations sur Villehardouin, p. 305, 306. Observations sur Joinville, p. 71, 72.]
[Footnote 17: Theophanes styles him, (p. 295.) Cedrenus (p. 437) brings this artist from (the ruins of) Heliopolis in Egypt; and chemistry was indeed the peculiar science of the Egyptians.]
[Footnote 18: The naphtha, the oleum incendiarium of the history of Jerusalem, (Gest. Dei per Francos, p. 1167,) the Oriental fountain of James de Vitry, (l. iii. c. 84,) is introduced on slight evidence and strong probability. Cinanmus (l. vi. p. 165) calls the Greek fire: and the naphtha is known to abound between the Tigris and the Caspian Sea. According to Pliny, (Hist. Natur. ii. 109,) it was subservient to the revenge of Medea, and in either etymology, (Procop. de Bell. Gothic. l. iv. c. 11,) may fairly signify this liquid bitumen.
Note: It is remarkable that the Syrian historian Michel gives the name of naphtha to the newly-invented Greek fire, which seems to indicate that this substance formed the base of the destructive compound. St. Martin, tom. xi. p. 420. - M.]
[Footnote 19: On the different sorts of oils and bitumens, see Dr. Watson's (the present bishop of Llandaff's) Chemical Essays, vol. iii. essay i., a classic book, the best adapted to infuse the taste and knowledge of chemistry. The less perfect ideas of the ancients may be found in Strabo (Geograph. l. xvi. p. 1078) and Pliny, (Hist. Natur. ii. 108, 109.) Huic (Naphthae) magna cognatio est ignium, transiliuntque protinus in eam undecunque visam. Of our travellers I am best pleased with Otter, (tom. i. p. 153, 158.)]
[Footnote 20: Anna Comnena has partly drawn aside the curtain. (Alexiad. l. xiii. p. 383.) Elsewhere (l. xi. p. 336) she mentions the property of burning. Leo, in the xixth chapter of his Tactics, (Opera Meursii, tom. vi. p. 843, edit. Lami, Florent. 1745,) speaks of the new invention. These are genuine and Imperial testimonies.]
[Footnote 21: Constantin. Porphyrogenit. de Administrat. Imperii, c. xiii. p. 64, 65.]
[Footnote 22: Histoire de St. Louis, p. 39. Paris, 1668, p. 44. Paris, de l'Imprimerie Royale, 1761. The former of these editions is precious for the observations of Ducange; the latter for the pure and original text of Joinville. We must have recourse to that text to discover, that the feu Gregeois was shot with a pile or javelin, from an engine that acted like a sling.]
[Footnote 23: The vanity, or envy, of shaking the established property of Fame, has tempted some moderns to carry gunpowder above the xivth, (see Sir William Temple, Dutens, &c.,) and the Greek fire above the viith century, (see the Saluste du President des Brosses, tom. ii. p. 381.) But their evidence, which precedes the vulgar aera of the invention, is seldom clear or satisfactory, and subsequent writers may be suspected of fraud or credulity. In the earliest sieges, some combustibles of oil and sulphur have been used, and the Greek fire has some affinities with gunpowder both in its nature and effects: for the antiquity of the first, a passage of Procopius, (de Bell. Goth. l. iv. c. 11,) for that of the second, some facts in the Arabic history of Spain, (A.D. 1249, 1312, 1332. Bibliot. Arab. Hisp. tom. ii. p. 6, 7, 8,) are the most difficult to elude.]
[Footnote 24: That extraordinary man, Friar Bacon, reveals two of the ingredients, saltpetre and sulphur, and conceals the third in a sentence of mysterious gibberish, as if he dreaded the consequences of his own discovery, (Biog. Brit. vol. i. p. 430, new edition.)]
Chapter LII: More Conquests By The Arabs.
Part II.
Constantinople and the Greek fire might exclude the Arabs from the eastern entrance of Europe; but in the West, on the side of the Pyrenees, the provinces of Gaul were threatened and invaded by the conquerors of Spain. ^25 The decline of the French monarchy invited the attack of these