Use of Name.
The name "Edom" is used by the Talmudists for the Roman empire, and they applied to Rome every passage of the Bible referring to Edom or to Esau. In Leviticus Rabbah (xiii.) Rome, under the name of "Edom," is compared to a boar, and the symbolic name "Seir" was used by the poets of the Middle Ages not only for Rome (comp. Ecclus. 1. 26, Hebr.), but also for Christianity (Zunz, "Literaturgesch." p. 620). On this account the word "Edom" was often expunged by the censor and another name substituted (Popper, "Censorship of Hebrew Books," p. 58). In place of "Edom," the word "Ḥazir" (swine) was occasionally used, perhaps as a mere term of reproach (but see Epstein, "Beiträge zur Jüd. Alterthumskunde," p. 35). In Midrash Tanḥuma Bereshyt, Hadrian is called "the King of Edom." The Talmudists, however, made an exception in favor of Antoninus Pius, whom they assured would attain paradise, because he had not acted in the manner of Esau ('Ab. Zarah 10b). 'Abodah Zarah 10a, however, explaining Obadiah, verse 2, says that Edom had neither written nor spoken language. This is inconsistent with its application to Rome.
See Teman.
http://www.jewishencyclopedia.com/articles/5434-edox-idumea
