Ctesias
Note by H Craik to chapter 3 of Tale of a Tub

Here again we have another curious illustration of Swift's strangely chosen reading. The Bibliotheca, or Myriobiblon, of Photius (Patriarch of Constantinople in the 9th century) contained a copious analysis, with excerpts, of an immense range of authors, including Ctesias, a physician of Cnidus, about 400 b. c., who spent much time in the East, and wrote upon Indian and Persian affairs. More than one edition of the Bibliotheca, with Latin versions, appeared in the 17th century. Swift's account of the extract is strictly correct; and Ctesias, as he says, seems to ascribe the bitterness

of the flesh to the presence of a gall
.
Swift must either have had a memory strangely stocked, or must have verified each quotation at the time of writing.