Xu Zaisi (Chinese: 徐再思; Wade–Giles: Hsü Tsai-szu, fl. fourteenth century) was a Yuan dynasty Chinese poet in sanqu style. His courtesy name was Deke (德可). He is said to have relished sweets, thereby adopting the pen name Tianzhai (甜斋, “Sweets Study”). His son Xu Shanchang also achieved notoriety. The elder Xu was at least a minor figure in officialdom, holding the rank of Circuit Sub official Functionary for Jiaxing in Zhejiang, his home city.
More Detail: http://en.wikipedia.org/wiki/Xu_Zaisi