 Complete the following phrase:  The Chinese dynastic histories of the Old Book of Tang and New Book of Tang mention 拂菻, which they equated with Daqin the Roman Empire. These are recorded as having begun in the year 643 with an embassy sent by the king Boduoli 波多力, Constans II Pogonatos to Emperor Taizong of Tang, bearing gifts such as red glass and green gemstones. Other contacts are reported taking place in 667, 701, and perhaps 719, sometimes through Central Asian intermediaries. These histories also record that the Arabs Da shi 大食 sent their commander Mo-yi Chinese: 摩拽伐之, Pinyin: Mó zhuāi fá zhī, to 