...of defiance

In reality, nothing was ever so extraordinary as the merchandise the stranger produced: most of his curiosities, which were not less admirable for their workmanship than splendour, had, besides, their several virtues described on a parchment fastened to each. There were slippers, which, by spontaneous springs, enabled the feet to walk; knives, that cut without motion of the hand; sabres, that dealt the blow at the person they were wished to strike; and the whole enriched with gems, that were hitherto unknown.
The sabres, especially, the blades of which, emitted a dazzling radiance, fixed, more than all the rest, the Caliph's attention; who promised himself to decipher, at his leisure, the uncouth characters engraven on their sides. Without, therefore, demanding their price, he ordered all the coined gold to be brought from his treasury, and commanded the merchant to take what he pleased. The stranger obeyed, took little, and remained silent.
Vathek, imagining that the merchant's taciturnity was occasioned by the awe which his presence inspired, encouraged him to advance; and asked him, with an air of condescension, who he was? whence he came? and where he obtained such beautiful commodities? The man, or rather monster, instead of making a reply, thrice rubbed his forehead, which as well as his body, was blacker than ebony; four times clapped his paunch, the projection of which was enormous; opened wide his huge eyes, which glowed like firebrands; began to laugh with a hideous noise, and discovered his long amber-coloured teeth, be streaked with green.
The Caliph, though a little startled, renewed his inquiries, but without being able to procure a reply. At which, beginning to be ruffled, he exclaimed: 'Knowest thou, wretch, who I am, and at whom thou art aiming thy gibes?' - Then, addressing his guards, - 'Have ye heard him speak? - is he dumb?' - 'He hath spoken,' they replied, 'but to no purpose.' 'Let him speak then again,' said Vathek, 'and tell me who he is, from whence he came, an where he procured these singular curiosities; or I swear, by the ass of Balaam, that I will make him rue his pertinacity.'
This menace was accompanied by one of the Caliph's angry and perilous glances, which the stranger sustained without the slightest emotion; although his eyes were fixed on the terrible eye of the Prince.

[Vathek, Beckford, W.]