Sejong the Great sibling Prince Hyoryeong
Early life
He was born on 10 April 1397, which was later adjusted to 15 May, after Korea's adoption of the Gregorian calendar in 1896. This date is his officially recognized birthday, and is celebrated along with National Teachers Day in South Korea.Sejong was the son of King Taejong by his wife, Queen Wongyeong. When he was twelve, he became Grand Prince Chungnyeong (충녕대군). During childhood, he was favored by his father over his two older brothers.
As the third son of the king, his ascension to the throne was unique. Taejong's eldest son, Yi Je (이제), was named heir apparent in 1404. However, his free spirited nature as well as his preference for hunting and leisure activities resulted in his removal from the position in June 1418. Though it is said that he abdicated in favor of Sejong, there are no definitive records. Taejong's second son, Grand Prince Hyoryeong (효령대군), became a Buddhist monk upon the elevation of his younger brother.Following Yi Je's demotion, Taejong moved quickly to secure his third son's place as heir apparent, and the government was purged of officials who disagreed with the change. In September 1418, Taejong abdicated. However, even in retirement he continued to influence government policy. Sejong's surprising political skill and creativity did not become apparent until after his father's death in 1422.
brother or sister kin