Early Joseon general who led the 1419 expedition to Tsushima
In 1419, the year after Sejong came to the throne, he attacked Tsushima, a base of Japanese pirates, on the orders of the retired king Taejong, who still held military power. After the expedition Joseon opened three ports at the request of the lord of Tsushima and later allowed limited trade under the Gyehae Treaty.
To strike the pirates at their base, Yi Jong-mu attacked Tsushima with some 200 ships; trade was later allowed under the 1443 treaty.
Third king of Joseon, who seized power in the Strifes of Princes and strengthened royal authority
Fourth king of Joseon, creator of Hangul, patron of science and of the northern frontier
The age when the civil-minded Song bought peace from Liao, Western Xia and Jin while the lower Yangtze boomed and Neo-Confucianism took shape, and the Ming, having driven out the Yuan, rebuilt the East Asian order through imperial autocracy, the sea ban and tribute — as Japan passed through the Kamakura and Muromachi warrior governments into the Warring States era, and Korea from Goryeo to Joseon