From
苏轼 《饮湖上初晴后雨二首·其二》 (ca. 1073, on West Lake):
水光潋滟晴方好,山色空蒙雨亦奇。欲把西湖比西子,淡妆浓抹总相宜 (rippling water sparkles when clear, just right; hills misty and empty when rain falls, marvelous too. I would liken West Lake to Lady Xi Shi: light makeup or heavy, she is always beautiful). The final couplet gave
西湖 its eternal nickname
西子湖 (Xizi Lake, Lady Xi's lake).