Many fantastic theories regarding pearls are to be found in ancient Chinese literature. Some writers credited them as originating in the brain of the fabled dragon; others noted that they were especially abundant during the reign of illustrious emperors, and they were used as amulets and charms against fire and other disasters. Curious allusions were made to pearls so brilliant that they were visible at a distance of nearly a thousand yards, or that rice could be cooked by the light from them. And one found about the beginning of the Christian era, near Yangchow-fu, in the province of Kiang-su, was reported so lustrous as to be visible in the dark at a distance of three miles. In Persia, the popularity of pearls seems to date from a very early period. Professor Jackson states that if they are not mentioned in the extant fragments of the ancient Zoroastrian literature, the Avesta and the Pahlavi, or by the Middle Persian books from the seventh century B.C. to the ninth century A.D., it is probably a mere accident, due to the character of the work or to the fragmentary condition of the literature; for pearls were well known during that entire period, and seem to be indicated in extant sculptures. The coin and the gem portraits of Persian queens commonly show ear-pendants of these. The remains of a magnificent necklace of pearls and other gems were recently found by J. de Morgan in the sarcophagus of an Achæmenid princess exhumed at Susa or Shushan, the winter residence of the kings of Persia. This necklace, perhaps the most ancient pearl ornament still in existence, dates certainly from not later than the fourth century B.C., and is now preserved in the Persian Gallery of the Louvre.[5] Even if we had no other evidence, it would be natural to assume that the knowledge of pearls was as wide-spread among the Iranians in antiquity as it was among the Hindus, since the Persian Gulf, like the Indian Ocean, has been famous for its fisheries from ancient times. In the ruins of Babylon no pearls have been found; indeed, it would be surprising if they could survive for so many ages in the relatively moist soil which contains much saltpeter. Inlays of mother-of-pearl and decorations of this material have been secured from the ruins of Bismaya, which Dr. Edgar J. Banks refers to about 4500 B.C.