Mencius, also known by his birth name Meng Ke or Ko, was born in the State of Zou, now forming the territory of the county-level city of Zoucheng; originally Zouxian), Shandong province, only thirty kilometres (eighteen miles) south of Qufu, Confucius' birthplace. He was an itinerant Chinese philosopher and sage, and one of the principal interpreters of Confucianism. Supposedly, he was a pupil of Confucius' grandson, Zisi. Like Confucius, according to legend, he travelled China for forty years to offer advice to rulers for reform. During the Warring States Period (403221 BCE), Mencius served as an official and scholar at the Jixia Academy in the State of Qi (1046 BCE to 221 BCE) from 319 to 312 BCE. He expressed his filial devotion when he took an absence of three years 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 is buried in the town of Zhou, just south of the town of Qufu in Shandong, China.