The Caucasus, here used, perhaps, like "Taurus," or "Alps," in the general sense of "lofty mountains," was a great centre of mediæval myth. Here was situated, according to most authorities, the wall of Alexander, when with an iron rampart he shut up Gog and Magog, and "twenty-two nations of evil men" from invading the fertile countries of the south (see _Koran_, chs. xv, xviii; the Arabic record of "Sallam the interpreter," sent to the Caucasus about 840 by the Caliph Wathek-Billah; Ibn Khordadbeh, c. 880; St. Jerome _On Genesis_, x, 2, and _On Ezekiel_, xxxviii-ix; St. Augustine, _De Civitate Dei_, xx, 11; St. Ambrose, _De Fide ad Gratianum_, ii, 4; St. Isidore, _Origines_, ix, 2; xiv, 3; and the _Commentaries_ of Andrew and Aretes of Caesarea _On the Apocalypse_ of A.D. _c._ 400 and _c._ 540; _Dawn of Modern Geography_, pp. 335-8, 425-434).] [Endnote 10: (p. 7). _Indians of Greater and Lesser India_ is a regular mediæval term for the inhabitants of India proper and of south-western Asia, sometimes including Abyssinia. Another frequent division was threefold: India Prima, Secunda, Tertia, or Greater, Lesser, and Middle, as in Marco Polo, Bk. III, chs. i, xxxviii-xxxix. Most commonly, Greater India means India west of Ganges; Lesser India corresponds to the classical _India extra Gangem_, or Assam, Burma, Siam, etc.; and Middle India stands for Abyssinia, and perhaps for some parts of the Arabian coast, as far as the Persian Gulf. On this passage we must also notice the following MS. notes:--