Mencius (ˈmɛnʃiəs ); born Meng Ke (); or Mengzi (; 372–289 BC) was a Chinese Confucian philosopher who has often been described as the "second Sage" (亞聖), that is, second to Confucius himself. He is part of Confucius' fourth generation of disciples. Mencius inherited Confucius' ideology and developed it further. Living during the Warring States period, he is said to have spent much of his life travelling around the states offering counsel to different rulers. Conversations with these rulers form the basis of the Mencius, which would later be canonised as a Confucian classic.
One primary principle of his work is that human nature is righteous and humane. The responses of citizens to the policies of rulers embodies this principle, and a state with righteous and humane policies will flourish by nature. The citizens, with freedom from good rule, will then allocate time to caring for their wives, brothers, elders, and children, and be educated with rites and naturally become better citizens. This placed him at odds with his near contemporary, Xunzi, who believed that human nature is evil by birth.
Mencius, also known by his birth name Meng Ke (孟軻), was born in the State of Zou. His birthplace is now within the county-level city of Zoucheng, Shandong Province.
He was an itinerant Chinese philosopher and sage, and one of the principal interpreters of Confucianism. Supposedly, he was a pupil of Confucius's grandson, Zisi. Like Confucius, according to legend, he travelled throughout China for forty years to offer advice to rulers for reform. During the Warring States period (403–221 BC), Mencius served as an official and scholar at the Jixia Academy in the State of Qi (1046 BC to 221 BC) from 319 to 312 BC. He expressed his filial piety when he took three years leave of absence from his official duties for Qi to mourn his mother's death. Disappointed at his failure to effect changes in his contemporary world, he retired from public life.
Mencius was buried in the Cemetery of Mencius (孟子林, Mengzi Lin, also known as 亞聖林, Yasheng Lin), which is located 12 km to the northeast of Zoucheng's central urban area.