died of her injuries. Lady Hyegyeong prepared her body for the funeral rites, but, on his return, Sado reportedly said nothing about Bing-ae's death. Execution In the summer of 1762, an altercation with an official at court enraged Sado. In revenge, he threatened to kill the official's son, and attempted to sneak through a water passage to the upper palace. He failed to find the son and, instead, confiscated clothing and items belonging to him. Rumours that Sado had attempted to enter the upper palace to kill King Yeongjo spread around the court. Fearing for the safety of her grandchildren, Royal Consort Yeong begged Yeongjo to deal with Sado. By court rules, the body of a royal could not be defiled and, under the then-common practice of communal punishment, Sado's wife and son (the family's only direct male heir) could also face death or banishment if he were executed as a criminal. As a solution, Yeongjo ordered Sado to climb into a wooden rice chest (roughly 1.3m square / 4 feet square) on a hot July day in 1762. According to Lady Hyegyeong's memoirs, Sado begged for his life before getting into the chest, though he attempted to get out again. Along with her children, Lady Hyegyeong was taken back to her father's house on the same day. After two days, King Yeongjo had the chest containing Sado tied with rope, covered with grass, and moved to the upper palace. Sado responded from inside the chest until the night of the seventh day; the chest was opened and he was pronounced dead on the eighth day. Yeongjo then restored him to the position of crown prince and gave him the posthumous title Sado, meaning "thinking of with great sorrow". Conspiracy theory During the 19th century, there were rumors that Prince Sado had not been mentally ill, but had been framed; however, these rumors are contradicted by his wife, Lady Hyegyeong, in The Memoirs of Lady Hyegyeong. Sado's death remains an issue of debate as to whether his death was retribution for his actual misconduct or if he was the victim of a conspiracy by his political opponents. Burial Crown Prince Sado was buried on Mt. BaebongSan in Yangju. His body was moved by his son, King Jeongjo, to its current location in 1789, then called Hyeonnyungwon near Suwon, 30 kilometers south of Seoul. Five years later the Hwaseong Fortress was