Li Hong
In 675, Li Hong, while visiting Hebi Palace (合璧宮), near Luoyang, with his parents, died suddenly. Most traditional historians believed that Empress Wu poisoned him to death. Emperor Gaozong was greatly saddened by his son's death, and he, in an unprecedented move, posthumously honored Li Hong the title of Emperor Xiaojing, and ordered that he be buried with honors due an emperor. (However, when an imperial tomb was to be built for Li Hong, it was said that the conscripted laborers were so displeased at the labor that they simply threw the construction material they had and deserted.)