宋史
The "Wenxian Tongkao", written by Chinese historian Ma Duanlin (1245-1322), and the "History of Song" describe how the Byzantine emperor Michael VII Parapinakēs Caesar ("Mie li sha ling kai sa" 滅力沙靈改撒) of "Fu lin" (拂菻, i.e. Byzantium) sent an embassy to China's Song dynasty, arriving in November 1081, during the reign of Emperor Shenzong of Song (r. 1067-1085). The "History of Song" described the tributary gifts given by the Byzantine embassy as well as the products made in Byzantium. It also described forms of punishment in Byzantine law, such as caning, as well as the capital punishment of being stuffed into a "feather bag" and thrown into the sea. This description seems to correspond with the Romano-Byzantine punishment of "poena cullei".