*** The site of Shapigan or Shaspigan is unknown. J. Darmesteter suggests that it ought to be read as _Shizigan_, which would permit of the identification of the place with Shiz, one of the ancient religious centres of Iran, whose temple was visited by the Sassanids on their accession to the throne. According to the Arda-Viraf the law was preserved at Istakhr, or Persepolis, according to the Shah- Namak at Samarcand in the temple of the Fire-god. Alexander is said to have burnt the former copy: the latter, stolen by the Greeks, is reported to have been translated into their language and to have furnished them with all their scientific knowledge. One of the Arsacids, Vologesus I., caused a search to be made for all the fragments which existed either in writing or in the memory of the faithful,* and this collection, added to in the reign of the Sassanid king, Ardashir Babagan, by the high priest Tansar, and fixed in its present form under Sapor I., was recognised as the religious code of the empire in the time of Sapor II., about the fourth century of the Christian era.*** The text is composed, as may be seen, of three distinct strata, which are by no means equally ancient;*** one can, nevertheless, make out from it with sufficient certainty the principal features of the religion and cult of Iran, such as they were under the Achaemenids, and perhaps even under the hegemony of the Medes. * Tradition speaks simply of a King Valkash, without specifying which of the four kings named Vologesus is intended. James Darmesteter has given good reasons for believing that this Valkash is Vologesus I. (50-75 A.D.), the contemporary of Nero. ** This is the tradition reproduced in two versions of the Dinkart. *** Darmesteter declares that ancient Zoroastrianism is, in its main lines, the religion of the Median Magi, even though he assigns the latest possible date to the composition of the Avesta as now existing, and thinks he can discern in it Greek, Jewish, and Christian elements. It is a complicated system of religion, and presupposes a long period of development. The doctrines are subtle; the ceremonial order of worship, loaded with strict observances, is interrupted at every moment by laws prescribing minute details of ritual,* which were only put in practice by priests and strict devotees, and were unknown to the mass of the faithful. * Renan defined the Avesta as "the Code of a very small religious sect; it is a Talmud, a book of casuistry and strict observance. I have difficulty in believing that the great Persian empire, which, at least in religious matters, professed a certain breadth of ideas, could have had a law so strict. I think, that had the Persians possessed a sacred book of this description, the Greeks must have mentioned it."