Cu?ng Ð? (??, IPA: [k?^?? ?e?]; born Nguy?n Phu?c Dân (Hán t?: ???); 11 January 1882 - 5 April 1951) was an early 20th-century Vietnamese revolutionary who, along with Phan B?i Châu, unsuccessfully tried to liberate Vietnam from French colonial occupation.Ð? was a royal relative of the Nguy?n 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 C?nh.
He was officially an "external marquis" (Ky Ngoai Hau).