a spring. When the Superior Man wears them, he complies with their purity and secures his repose. When lords and kings treasure them, they rectify the world. (Chapter 16.19) The latter compares true understanding with wealth, "Acquiring an army of ten thousand men does not compare to hearing one word that is apposite / acquiring the pearl of the marquis of Sui [隨侯之珠] does not compare to understanding from whence events arise / Acquiring the jade disk of Mr. Gua [咼氏之璧] does not compare to understanding where events will lead." (Chapter 16.105) The Huainanzi mentions Mr. He's jade-disk along with the Xiahou clan's semi-circular jade. "As for [ritual emblems like] the jade disk of Mr. He [咼氏之璧] and the jade half-disk of the Xiahou clan [夏后之璜]," if [courtiers] bow courteously and advance with them, they create harmony and amity. [But] at night because of thieves, they create resentment. Such is the difference between the right time and the wrong time." (Chapter 16.90) Other regalia Many Chinese classics refer to Bian He's jade-disk in context with other legendary gems, jades, and swords constituting the ceremonial regalia of ancient Chinese states. The most common example is Marquis of Sui's pearl, a legendary glow-in-the-dark gemstone given to the marquis by a grateful snake whose life he saved. Other luminous gemstones frequently mentioned with Mr. He's jade-disk are the Yeguangzhibi (夜光之璧, "night-shining jade-disk") and the Míngyuèzhīzhū (明月之珠, "bright-/luminous-moon pearl"). These ancient Chinese names were sufficiently well known to have been applied to foreign gemstones in the earliest accounts of Daqin (the Roman Empire). "The Kingdom of Daqin" section of the 5th-century Book of the Later Han, which was largely based on Ban Yong's report presented to Emperor An of Han in around 125, lists precious Roman trade goods including "luminous jade [夜光璧]" and "bright moon pearls [明月珠]". Mr. He's jade-disk is mentioned in the Huainanzi with the Xiahou clan's semi-circular jade pendant: Xiahoushi zhi huang (夏后氏之璜), which was a jewel supposedly included in the ducal regalia of Lu state. Xiàhòu (夏后) is a Chinese compound surname from the Spring and Autumn period (771-476 BCE), and the huáng (璜, "semi-circular jade pendant") was anciently used for ritual purposes or as a belt ornament. Tai'e or Tai'a (太阿) is the name of a famous Spring and Autumn period iron sword that is usually considered one of the ten legendary swords of China. The legendary bladesmith Ou