The Aramaic version of the Alexander Romance may be considered FE literature, as it depicts the earth as a flat plane. It mentions a "window" on one side of the earth where the sun rises and a "window" on the other end where it sets.
Although I obviously disagree with the idea of there being "windows" on the earth's surface where the sun sets and rises, the timing of this legend (the 7th century AD) seems to cast major doubt on the idea that everyone had been convinced by the theories of Pythagoras by that time.
Skip ahead to pg. 144 to read the legend:
http://www.attalus.org/armenian/Budge_Syriac_Alexander.pdfIntrugingly enough, and I as have referenced elsewhere, this legend was plagiarized by the Mohammendans and was modified and copied into Surah 18 of the Koran: