Cường Để

Prince Cường Để (born Nguyễn Phúc Đan; 阮福單); 11 January 1882 – 5 April 1951) was an early 20th-century Vietnamese revolutionary who, along with Phan Bội Châu, unsuccessfully tried to liberate Vietnam from French colonial occupation.

Để was a royal relative of the Nguyễn dynasty, and, according to the rule of primogeniture, was the heir of the dynasty, directly issued from the line of first-born descendants of Emperor Gia Long and his son Prince Cảnh. He was officially an "external marquis" (Ky Ngoai Hau).