To proceed, then: Don Fernando finding my presence an obstacle to the execution of his treacherous and wicked design, resolved to send me to his elder brother under the pretext of asking money from him to pay for six horses which, purposely, and with the sole object of sending me away that he might the better carry out his infernal scheme, he had purchased the very day he offered to speak to my father, and the price of which he now desired me to fetch.
There are no more uses of "pretext" in the book.
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They used the incident as a pretext to invade the country.
She thinks the need for international pollution control is being used as a pretext to create a world government that supersedes national sovereignty with extensive rule making and taxing authority.