In the Middle Ages, variations on the liar paradox were studied under the name of insolubilia ("insolubles").
Although the liar paradox was well known in antiquity, interest seems to have lapsed until the twelfth century, when it appears to have been reinvented independently of ancient authors.
Other ancient sources which could suggest the liar paradox, including Saint Augustine, Cicero, and the quotation of Epimenides appearing in the Epistle to Titus, were not cited in discussions of insolubilia.
There was an established literature on the topic by about 1320, when Thomas Bradwardine prefaced his own discussion of insolubilia with nine views then current.
[1] The medieval insolubilia literature seems to treat these paradoxes as difficult but not truly "insoluble", and, though interesting and meriting investigation, not central to the study of logic.