Grand Prince Yangnyeong (Hangul: 양녕대군, 1394–1462) was a former Crown Prince of the Joseon Dynasty of Korea. He was the first son and fourth child of King Taejong and his wife, Queen Wongyeong. Yangnyeong was the elder brother of Sejong the Great, and an ancestor of Syngman Rhee, an independence activist and the first President of South Korea.

Grand Prince Yangnyeong - Wikipedia