Yong Saetae (; , Teochew: Dên Iong; ?–?) was a Chinese merchant and the father of King Taksin the Great. The Vietnamese called him Trịnh Yển (鄭偃).Việt Nam sử lược, vol. 2, chap. 6Đại Nam chính biên liệt truyện sơ tập, vol. 32: "茫薩長鄭國英淸潮洲人其父偃流寓于暹爲茫薩長"
His birth name was Dên Dag (). Born in Chenghai County, Chaoshan, China.Woodside 1971, p. 8.Are we them? The Chinese in 20th-century Thai literature and history, pp. 189 It was said that he was a broad-minded and unconventional man. His fellow countrymen did not like him, and called him Pai Gian Dag ( or , lit. "Dag, the ruffian" in Teochew).四十二梅居士, 鄭昭傳 he came to Siam to do business,Draft History of Qing, vol.528: "昭中國廣東人也父賈于暹羅生昭" and became rich, and changed his name to Yong Saetae. Later, he became a tax-collector, and married a wealthy royal woman Nok-lang (later Princess Phithak Thephamat), who later gave birth to Taksin.
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