Definition of "pesant"

[M]y honoured Lord, ſaid Iſabella, who reſented Theodore’s warmth, which ſhe perceived was dictated by his ſentiments for Matilda, diſcompose not yourſelf for the gloſing of a of a peſant’s ſon: He forgets the reverence he owes you; but he is not accuſtomed⸺[…]The 1st edition uses peaſant.

1765 , Onuphrio Muralto, translated by William Marshal [pseudonyms; Horace Walpole], chapter IV, in The Castle of Otranto, […], Dublin: […] J. Hoey, […], page 99