linguistic:paraphrasing, structural:scholar_edition
Trade and diplomacy with the Byzantine Empire

Shortly after the smuggling of silkworm eggs into the Byzantine Empire from China by Nestorian Christian monks, the 6th-century Byzantine historian Menander Protector writes of how the Sogdians attempted to establish a direct trade of Chinese silk with the Byzantine Empire. After forming an alliance with the Sasanian ruler Khosrow I to defeat the Hephthalite Empire, Istämi, the Göktürk ruler of the First Turkic Khaganate, was approached by Sogdian merchants requesting permission to seek an audience with the Sassanid king of kings for the privilege of traveling through Persian territories in order to trade with the Byzantines. Istämi refused the first request, but when he sanctioned the second one and had the Sogdian embassy sent to the Sassanid king, the latter had the members of the embassy poisoned. Maniah, a Sogdian diplomat, convinced Istämi to send an embassy directly to Byzantium's capital Constantinople, which arrived in 568 and offered not only silk as a gift to Byzantine ruler Justin II, but also proposed an alliance against Sassanid Persia. Justin II agreed and sent an embassy to the Turkic Khaganate, ensuring the direct silk trade desired by the Sogdians.

It appears, however, that direct trade with the Sogdians remained limited in light of the small amount of Roman and Byzantine coins found in Central Asian and Chinese archaeological sites belonging to this era. Although Roman embassies apparently reached Han China from 166 AD onwards, and the ancient Romans imported Han Chinese silk while the Han dynasty Chinese imported Roman glasswares as discovered in their tombs, Valerie Hansen (2012) wrote that no Roman coins from the Roman Republic (507–27 BC) or the Principate (27 BC – 330 AD) era of the Roman Empire have been found in China. However, Warwick Ball (2016) upends this notion by pointing to a hoard of sixteen Roman coins found at Xi'an, China (formerly Chang'an), dated to the reigns of various emperors from Tiberius (14–37 AD) to Aurelian (270–275 AD). The earliest gold solidus coins from the Eastern Roman Empire found in China date to the reign of Byzantine emperor Theodosius II (r. 408–450) and altogether only forty-eight of them have been found (compared to thirteen-hundred silver coins) in Xinjiang and the rest of China. The use of silver coins in Turfan persisted long after the Tang campaign against Karakhoja and Chinese conquest of 640, with a gradual adoption of Chinese bronze coinage over the course of the 7th century. The fact that these Eastern Roman coins were almost always found with Sasanian Persian silver coins and Eastern Roman gold coins were used more as ceremonial objects like talismans, confirms the pre-eminent importance of Greater Iran in Chinese Silk Road commerce of Central Asia compared to Eastern Rome.