科举
Cao Xuân Dục was born in Thịnh Mỹ, Diễn Châu, Nghệ An. In 1876, he entered Vietnamese Imperial examination and was awarded the degree of provincial graduate (舉人 - cử nhân), in the same class with the famous anti-French patriot Phan Đình Phùng from Hà Tĩnh.