Two adjacent eras spanning 770-221 BC, named after the chronicle 《
春秋》 ('Spring and Autumn Annals', traditionally edited by Confucius) and the later phase of constant warfare among the seven major states. The
诸子百家 ('Hundred Schools of Thought') flowered here — Confucianism, Daoism, Mohism, Legalism — before Qin Shi Huang unified everything in 221 BC.