衍圣公
In 1055, Emperor Renzong, changed the "Duke Wenxuan" title to "Duke Yansheng" () to avoid naming taboo associated with the posthumous names of the earlier emperors. The title "Duke Yansheng" was then awarded to Kong Zongyuan (), a 46th-generation descendant of Confucius. It was later changed to "Duke Fengsheng" () but was quickly restored back to "Duke Yansheng", and has since then been known as "Duke Yansheng".