The 4th century Roman historian Ammianus Marcellinus noted that the Alans were "formerly called Massagetae," while Dio Cassius wrote that "they are Massagetae." It is likely that the Alans were an amalgamation of various Iranian peoples, including Sarmatians, Massagetae and Sakas. Scholars have connected the Alans to the nomadic state of Yancai mentioned in Chinese sources. The Yancai are first mentioned in connection with late 2nd century BCE diplomat Zhang Qian's travels in Chapter 123 of "Shiji" (whose author, Sima Qian, died c. 90 BCE). The Yancai of Chinese records has again been equated with the Aorsi, a powerful Sarmatian tribe living between the Don River and the Aral Sea, mentioned in Roman records, in particular Strabo.