of his son John; and they unsheathed a dangerous weapon of revenge, by dismissing the true or false Mustapha, who had long been detained as a captive and hostage, and for whose maintenance they received an annual pension of three hundred thousand aspers. [81] At the door of his prison, Mustapha subscribed to every proposal; and the keys of Gallipoli, or rather of Europe, were stipulated as the price of his deliverance. But no sooner was he seated on the throne of Romania, than he dismissed the Greek ambassadors with a smile of contempt, declaring, in a pious tone, that, at the day of judgment, he would rather answer for the violation of an oath, than for the surrender of a Mussulman city into the hands of the infidels. The emperor was at once the enemy of the two rivals; from whom he had sustained, and to whom he had offered, an injury; and the victory of Amurath was followed, in the ensuing spring, by the siege of Constantinople. [82] [Footnote 79: The writer who has the most abused this fabulous generosity, is our ingenious Sir William Temple, (his Works, vol. iii. p. 349, 350, octavo edition,) that lover of exotic virtue. After the conquest of Russia, &c., and the passage of the Danube, his Tartar hero relieves, visits, admires, and refuses the city of Constantine. His flattering pencil deviates in every line from the truth of history; yet his pleasing fictions are more excusable than the gross errors of Cantemir.] [Footnote 80: For the reigns of Manuel and John, of Mahomet I. and Amurath II., see the Othman history of Cantemir, (p. 70--95,) and the three Greeks, Chalcondyles, Phranza, and Ducas, who is still superior to his rivals.] [Footnote 81: The Turkish asper (from the Greek asproV) is, or was, a piece of _white_ or silver money, at present much debased, but which was formerly equivalent to the 54th part, at least, of a Venetian ducat or sequin; and the 300,000 aspers, a princely allowance or royal tribute, may be computed at 2500_l_. sterling, (Leunclav. Pandect. Turc. p. 406--408.) * Note: According to Von Hammer, this calculation is much too low. The asper was a century before the time of which writes, the tenth part of a ducat; for the same tribute which the Byzantine writers state at 300,000 aspers the Ottomans state at 30,000 ducats, about 15000l Note, vol. p. 636.--M.] [Footnote 82: For the siege of Constantinople in 1422, see the particular and contemporary narrative of John Cananus, published by Leo Allatius, at the end of his edition of Acropolita, (p. 188--199.)]