form, the treasury building was composed of twenty-one rooms grouped around a square courtyard of approximately on a side. The thirteen rooms on the southern, eastern, and western sides opened directly onto this courtyard, while the eight storage rooms to the north were accessed from doors on an east–west corridor. The complex housed the inventory of the palace in vases labelled in Greek, including gemstones and lapis lazuli from the Badakshan mines, ivory, olive oil, incense, a cash reserve, and other valuables. Many of the vase labels, which were either written with ink or inscribed post-firing, describe monetary transactions: for example, one attests that an official named Zenon had transferred 500 drachmas to two employees named Oxèboakès and Oxybazos, who were responsible for depositing the sum in the vase and sealing it. Some of the other vases indicate transportation of luxury goods, such as incense from the Middle East, or olive oil from the Mediterranean. Because of the perishable nature of the oil inside it, one of these vases is inscribed with the regnal year of the monarch (Year 24). Combined with other inscriptions in the treasury, and the identification of the ruling monarch as Eucratides I, the date of Ai-Khanoum's fall has been dated with fair certainty to around 145 BC. Several items in the treasury are likely to have been loot brought back by Eucratides from his Indian conquests: these include Indian agates and jewellery, offerings from Buddhist stupas, and a disc of mother-of-pearl plates depicting a scene from Hindu mythology. This disc, which was decorated with polychrome glass paste and gold thread, most probably represents the meeting of Dushyanta and Shakuntala. The library was located at the south of the treasury near the residential quarters. Its function was identified through the discovery of two literary fragments, one on papyrus and the other on parchment; the organic writing material had decomposed, but through a process similar to decalcomania, the letters had been engraved on fine earth formed from mudbrick decomposition. The parchment constituted an unknown theatrical work, most probably a trimetrical tragedy, possibly involving Dionysus, a figure known for travelling to India and the East. On the other hand, the papyrus was a philosophical dialogue discussing the theory of forms of Plato, which some have considered a lost work by Aristotle. It is also possible, conversely, that the text was written by a Greco-Bactrian philosopher in Ai-Khanoum. Private