His grave was among the wicked, his tomb with evildoers,
(Isaiah 53:9)
Owing to the identification of Rome's angel with Samael, chief of the evil spirits, Armilus in the course of time was identified with Romulus (see Bousset's "Antichrist," pp. 66, 67). The name given to Armainyush in other Jewish eschatologies was Belial (Beliar, II Cor. vi. 14; Sibylline Books, ii. 6, 15, iii. 63; Testaments of the Twelve Patriarchs, Dan. v.), the same as "spirit of hell" (see Ps. xviii. 5 and Bäthgen's Comm.), hence the "son of perdition" (II Thess. ii. 3) and the "man of sin," that is, rasha', "the Wicked" (Isa. xi. 4). Thus the Serpent is spoken of as Harasha', "the Wicked One," in Gen. R. xx., Bek. 8a (compare Targ. Yer. Gen. iii. 13); and Rome as the wicked kingdom, Malkut ha-resha'ah (Gen. R. lxxvi.).
http://www.jewishencyclopedia.com/articles/1003-ahriman
According to the Jewish Encyclopedia, Armilus is "a king who will arise at the end of time against the Messiah, and will be conquered by him after having brought much distress upon Israel." He is spoken of in the Midrash Vayosha, Sefer Zerubbabel and other texts. He is an adversary similar to Gog and Magog. In the Sefer Zerubbabel he takes the place of Magog and defeats the Messiah ben Joseph.[3]: 60
https://en.m.wikipedia.org/wiki/Armilus