By the middle of the tenth century, the Khitan, with a population of about 750,000 ... the Kingdom of Koryo accepted a status as a vassal of the Liao. Meanwhile the Song Dynasty reunified China in 960 ...

In the Han Dynasty compasses consisted of a bronze on which 24 directions were carved and a rod made from a natural magnet. Such devices were in use until the eighth century. In the Song Dynasty ...

The Society for Song, Yuan, and Conquest Dynasty Studies is an international society committed to the encouragement of the study of Chinese—as well as Jürchen, Khitan, Tangut, and Mongol—history, ...

This is Kaifeng City, Henan Province. In A.D. 960, Zhao Kuangyin established the Song (宋) Dynasty and made this place the national capital. In the ensuing 160 years and more, Kaifeng remained the ...

In the early 11th century, the Tuoba group of the ancient ... to the Tang and was awarded the surname Li, in the early Song Dynasty, it declared itself a vassal state of the Song and was awarded ...

Study tracking climate patterns across thousands of years found that periods of lower rainfall coincided with some major political upheavals Researchers have used tree rings to track rainfall patterns ...