Crown Prince Hyojang was a Joseon Crown Prince and the first and illegitimate son of King Yeongjo of Joseon. He also become the adoptive father of King Jeongjo of Joseon, his half nephew, but he died at a young age.
In 1762, 34 years after his death, he was adopted to his half-nephew Yi San by his father King Yeongjo and in 1776 was appointed to the title of Honor King, 48 years after his death. His other title was Prince Kyeongui. His real name was Yi Haeng. His first name was Manbok. His courtesy name was Seonggyeong.