East Asian philosophical thought began in Ancient China, and Chinese philosophy begins during the Western Zhou Dynasty and the following periods after its fall when the "Hundred Schools of Thought" flourished (6th century to 221 BCE). This period was characterized by significant intellectual and cultural developments and saw the rise of the major Chinese philosophical schools (Confucianism, Legalism, and Daoism) as well as numerous less influential schools (Mohism, School of Names, School of Yin Yang). These philosophical traditions developed metaphysical, political, and ethical theories which, along with Chinese Buddhism, had a direct influence on the rest of the East Asian cultural sphere. Buddhism began arriving in China during the Han Dynasty (206 BCE–220 CE), through a gradual Silk road transmission and gradually developed distinct Chinese forms (such as Chan/Zen).