When Alexander the Great conquered Persia in 332 B.C., elated by his victory, and having drunk heavily of wine, he allowed his soldiers to burn the capital, and with it perished much of greatest value. Most of the Persian literature was then destroyed, together with the noblest specimens of Persian architecture and decoration. While cities were few, it seems remarkable that the only copies of the Avesta were burned. For several centuries following, the teachings of this sacred book lived only in the memories of priests. Finally in 325 A.D., a council was called to take measures to have these ancient doctrines committed to writing. Naturally the result was fragmentary and incomplete. Only those portions of the original text which had been in daily use proved to be well remembered. These were mainly prayers and invocations. The priests in all probability, seized the opportunity to insert whatever forms of worship and modified beliefs they desired to emphasize. Their final effort, while far from satisfactory, embraces all which now remains of the religion of Zoroaster and his followers. In 636 A.D. the Mohammedan Arabs made a religious crusade and undertook to blot out the old Persian religion. Most of the descendants of the early nation yielded to the fire and sword. A small portion of them took refuge in India, where they were allowed to worship as they chose. Only with them was the Avesta preserved. These Parsis have been called "the ruins of a people, as their sacred books are the ruins of a religion." Of them Justi writes: "There is no religious body in the world whose practice is so completely in harmony with their moral code." The collection of Zend Fragments, commonly known as the Zend-Avesta, falls into two parts: The Avesta, properly so-called, which contains (1) compilations of religious laws and mythical tales; (2) collections of litanies for the sacrifice; (3) litanies and hymns written in a language older than the rest of the Avesta. Secondly, these writings contain the Small Avesta, made up of short prayers, recited by all the faithful. It was fitting that these collections of fragments be preserved, so far as possible, in their original dialect, but since these were no longer intelligible even to the educated, the Zend, or explanation--commentary--was attached in the prevailing tongue. Otherwise the greater portion of the work could not have been understood. Some of the creation stories were not included in the Avesta, but were gathered together with other myths in the Bundehesh.