Manchurian tribal leader who in 1636 became emperor of the Manchu, Mongols, and Chinese in Manchuria (Northeast China). In addition, for his family he adopted the name of Qing (Qing dynasty) (“Pure”), which also became the name of the Chinese dynasty (1644–1911/12) ruled by the Manchu.

Abahai was the eighth son of Nurhachi (1559–1626), the great Manchu leader who extended his people's rule over the tribes of the Inner Asian steppes and organized his tribesmen into a bureaucratic Chinese-style state. Soon after his father's death, Abahai eliminated his brothers as rivals and consolidated his personal rule. He was successful largely because of his extraordinary ability as a military leader. He led armies into Mongolia and Korea and made those countries vassal states of the Manchu. With the increased monetary and food supplies available from Korea and with the additional manpower and horses from the Mongols, he perfected the military machine known as the Eight Banners. After four expeditions he finally occupied the formerly Chinese-controlled Amur region of northern Manchuria and three times broke through the Great Wall (Great Wall of China) on raids into North China.

As more Chinese were captured and taken into Manchu service, the government was able to duplicate more exactly the organizational structure of its Chinese counterpart. Thus other talented Chinese were induced to join. On the advice of his Chinese advisers, Abahai changed his dynastic name from Jin to Qing and began the conquest of China. Although he died before his goal was realized, his reign greatly strengthened the foundations of Manchu rule. A year after his death the Manchu conquered Beijing, the capital of China's Ming dynasty, and shortly after subdued the remainder of the country.