Ren Yu 无货 (1853-1901) was the youngest, most eccentric, and least prolific of the Four Rens (<a href=" https://findartvalue.com/artist/ren-xiong">Ren Xiong</a>, <a href=" https://findartvalue.com/artist/ren-xun">Ren Xun</a>, and <a href=" https://findartvalue.com/artist/ren-yi">Ren Yi</a> [Bonian]) a family of prominent painters in Shanghai during the late Qing dynasty (1644-1911). Source: Clevel