Which province has the most celebrities in China since ancient times?

Gansu, of course: first of all, your ancestors were from Gansu, and only from Gansu: because your ancestors, Nu Wa Niangniang Fu Xishi, were from Tianshui, Gansu. Followed by the first emperor of China, Qin Shihuang Ying Zheng was from Lixian County, Gansu Province. The other is Li Shimin, who pushed Chinese civilization to the peak of history. His roots are in Longxi, Gansu. The rest are children and grandchildren, so I won't mention it.