Taejo of Joseon (1335–1408), born Yi Seonggye, founder of the Joseon dynasty
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Taejo of Goryeo (877–943), born Wang Geon, founder of the Goryeo dynasty
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Taejo of Goguryeo (47–165), born Go Gung, sixth monarch of Goguryeo
Taejo was born in 877 and was a descendant of a merchant family at Songdo (present-day Kaesŏng), who controlled trade on the Yeseong River.