Many years after the Arab conquest the ruins that covered Persia excited the admiration of the Arabs. Their geographers of the ninth and tenth centuries considered it their duty to enumerate the principal buildings of the Sasanians reminding the reader that here Khusro built in his time in bye-gone days a castle, there a mountain fastness, again at a third place, a bridge.[1] Regarding various ancient structures which had survived the Sasanian times, we refer, _inter alia_, to Istakhri, (ibid I), pp. 124; Ibn Hauqal (ibid II) 195; Ibn Khordadbeh (ibid VI) p. 43, (text); Ibn Rusteh (ibid VII), 153, 162, 164, 165, 166, 167, 189; Yakubi (ibid VII), 270, 271, 273, &c. [Footnote 1: _See_ the enumeration of the noteworthy buildings of ancient Persia as given in Makdisi (B.G.A. III), p. 399, and Ibn-ul-Fakih (_ibid_ V), p. 267.] The remains of the structures, monuments of art from the Sasanian times and the ages preceding them attracted the attention of the Arabs and they have left descriptions of the same in more or less detail.[1] From the information of the same Musalman writers we possess accurate accounts of the inhabitants of Persia and their religions. Thus, for instance, Yakubi indicates that the inhabitants of Isfahan, Merv, and Herat, consisted mainly of high-born Dehkans.[2] Makdisi notices a considerable number of fire-worshippers in several provinces of Persia, for instance, Irak and Jibal.[3] [Footnote 1: Istakhri, p. 203, Ibn Hauqal, p, 266, 256, Makdisi pp. 396 and 445, Ibn Rusteh, p. 166.] [Footnote 2: Yakubi, pp. 274, 279-280.] [Footnote 3: Makdisi, pp. 126, 194.] ISTAKHRI AND IBN HAUQAL[1] _Relate that the inhabitants of several localities of Kerman during the entire Umayyad period openly professed Mazdaism._ In a more detailed fashion, however, the Arab writers notice the Mazdian dwellers of Fars, the heart of the Persian dominion. Makdisi says that in Fars existed the customs of fire-worshippers but that the fire-worshipping inhabitants of the capital of the province of Shiraz had no distinguishing mark on their clothes; from which it follows that in that age these people were in no way differentiated from the Musalman subjects.[2] Istakhri[3] and Ibn Hauqal[4] relate that the bulk of the inhabitants of Fars consisted of fire-worshippers and they were there in larger number than anywhere else, Fars being the centre of sacerdotal and cultural life of the empire in the days of Persian independence. Very minute information is supplied us by these writers[5] regarding the ancient castles and fire-temples scattered over the whole of Fars in abundance. The latter is of capital importance since here was the residence of those two classes of Persian society, noblemen and priests, who were the staunchest conservators of the ancient national tradition. [Footnote 1: Istakhri, p. 164; _Ibn_ Hauqal, p. 221.] [Footnote 2: _See_ Makdisi, pp. 421, 429.] [Footnote 3: P. 130.] [Footnote 4: P. 207.]