The reigns of the next four kings (King Gong of Zhou, King Yi of Zhou (Ji Jian), King Xiao of Zhou, and King Yi of Zhou (Ji Xie)) are poorly documented. The ninth king is said to have boiled the Duke of Qi in a cauldron, implying that the vassals were no longer obedient. The tenth king, King Li of Zhou (877–841 BC) was forced into exile and power was held for fourteen years by the Gonghe Regency. Li's overthrow may have been accompanied by China's first recorded peasant rebellion. When Li died in exile, Gonghe retired and power passed to Li's son King Xuan of Zhou (827–782 BC). King Xuan worked to restore royal authority, though regional lords became less obedient later in his reign. The twelfth and last king of the Western Zhou period was King You of Zhou (781–771 BC). When You replaced his wife with a concubine, the former queen's powerful father, the Marquess of Shen, joined forces with Quanrong barbarians to sack the western capital of Haojing and kill King You in 771 BC. His killing resulted to beginning wars between local states which continued until Qin unification of China. Some scholars have surmised that the sack of Haojing might have been connected to a Scythian raid from the Altai before their westward expansion. Most of the Zhou nobles withdrew from the Wei River valley and the capital was reestablished downriver at the old eastern capital of Chengzhou near modern-day Luoyang. This was the start of the Eastern Zhou period, which is customarily divided into the Spring and Autumn period and the Warring States period.