Korean Confucianism
Under the succeeding Han Dynasty and Tang Dynasty, Confucian ideas gained even more widespread prominence. During the Song Dynasty, the scholar Zhu Xi (AD 1130–1200) added ideas from Taoism and Buddhism into Confucianism. In his life, Zhu Xi was largely ignored, but not long after his death his ideas became the new orthodox view of what Confucian texts actually meant. Modern historians view Zhu Xi as having created something rather different, and call his way of thinking Neo-Confucianism. Neo-Confucianism held sway in China, Japan, Korea and Vietnam until the 19th century.
Zhu Xi
"Zhu" Xi maintained that all things are brought into being by the union of two universal aspects of reality: "qi", sometimes translated as vital (or physical, material) force; and "li", sometimes translated as rational principle (or law). The source and sum of "li" is the "Taiji" (Wade-Giles: T‘ai Chi), meaning the Supreme Ultimate. The source of "qi" (Wade-Giles: ch‘i) is not so clearly stated by Zhu Xi, leading some authorities to maintain that he was a metaphysical monist and others to maintain that he was a metaphysical dualist.