明代無錫人尤鏜《梁溪雜事》有無錫人李圭在靠近太倉的玄雲島稱王的記載，玄雲島應即雙嶼島，其讀音接近，位置也相符。《梁溪雜事》說玄雲島最初是神僧用火器開拓，很可能是指西方傳教士。玄雲島的貿易主要是把江南的棉布外銷，把金、漆、崖蜜、香藥等外國貨物輸入江南。玄雲島記載說明，在朱紈死後，六橫島的貿易仍然比較繁榮。

This paper uncovers a new historical material about Shuangyu Port in Liuheng Island (Zhejiang Province) for the first time - the story of Li Gui of Wuxi county proclaimed himself as the king of Xuanyun Island near Taicang, as recorded in Liang Xi Za Shi by You Tang. Xuanyun Island was simply Shuangyu Island because of the similar pronunciation and the same location. The Buddhist monk who used firearms in the story was perhaps a missionary from Europe. The merchants in Xuanyun Island traded cotton cloth from Jiangnan for gold, lacquer, honey, and spice from abroad. This story indicated that the commerce in Liuheng Island was still flourishing during late Jiajing period after the death of Zhu Wan.