Gu Yanwu
Gu Yanwu () (July 15, 1613 – February 15, 1682), also known as Gu Tinglin (), was a Chinese philologist, geographer, and famous scholar-official in Qing dynasty. He spent his youth during the Manchu conquest of China in anti-Manchu activities after the Ming dynasty had been overthrown. He never served the Qing dynasty. Instead, he traveled throughout the country and devoted himself to studies.