The so-called Greater (or Great) Yuezhi (Dà Yuèzhī, 大月氏) began migrating north-west in about 165 BC, first settling in the Ili valley, immediately north of the Tian Shan mountains, where they defeated the Sai (Sakas): The Yuezhi attacked the king of the Sai who moved a considerable distance to the south and the Yuezhi then occupied his lands (Book of Han 61 4B). This was the first historically recorded movement of peoples originating in the high plateaus of Asia.