Quite a few people in the Sky-Cloud Empire had heard of Country Yao Chen. This was because His Grace—Rong Xiu's birth mother had secretly married Country Yao Chen's emperor back then.
Everyone in the Sky-Cloud Empire knew of his identity as Country Yao Chen's Seventh Prince.
All of these incidents were spread far and wide when Rong Xiu was found by them back then; almost everybody knew about it. This was also the reason why they thought of Rong Xiu as the clan's humiliation all this while.
If the Extreme God Sundial hadn't automatically appeared when he first arrived on the mountain and stood in front of Jishen Palace—which tested and showed his shocking bloodline talent—he would've very possibly been executed in front of the Sky-Cloud Empire's many ancestral plaques.
All these years, Rong Xiu's power in the entire Sky-Cloud Empire grew increasingly greater as his cultivation level kept improving. With that, the masses gradually stopped bringing it up.