Taken from Wikipedia 
 
The person in question is Emperor  Bảo Đại 
Vietnamese:  [ɓa᷉ːw ɗâːjˀ] ,  Hán tự :  保 大 , lit. "keeper of greatness", 
(22 October 1913 – 30 July 1997), born  Nguyễn Phúc Vĩnh Thụy , 
He was the 13th and final  emperor  of the  Nguyễn dynasty , the last ruling family of  Vietnam . From 1926 to 1945, he was emperor of  Annam , which was then a protectorate in  French Indochina , covering the central two thirds of the present-day Vietnam. 
The Japanese ousted the  Vichy French  administration in March 1945 and then ruled through Bảo Đại, who renamed his country "Vietnam". He abdicated in August 1945 when Japan surrendered. From 1949 to 1955, Bảo Đại was the chief of state of the  State of Vietnam  (South Vietnam). Viewed as a puppet ruler, Bảo Đại was criticized for being too closely associated with France and spending much of his time outside Vietnam. He was eventually ousted in a  referendum  in 1955 by Prime Minister  Ngô Đình Diệm , who was supported by the United States. 
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In 1957, during his visit to Alsace region, he met Christiane Bloch-Carcenac with whom he had an affair for several years. The relationship with Bloch-Carcenac resulted in the birth of his last child, Patrick-Edward Bloch-Carcenac, who still lives in Alsace in France. 
In 1972, Bảo Đại issued a public statement from exile, appealing to the Vietnamese people for national  reconciliation , stating, "The time has come to put an end to the  fratricidal  war and to recover at last peace and accord". He still reportedly held great influence among local political figures in the  Quảng Trị  and  Thừa Thiên  provinces of  Huế . The Communist government of  North Vietnam  sent representatives to France hoping that Bảo Đại would become a member of a coalition government which might reunite Vietnam, in the hope of attracting his supporters in the regions wherein he still held influence. 
As a result of these meetings, Bảo Đại publicly spoke out against the presence of  American troops  in South Vietnam, and he criticized President  Nguyễn Văn Thiệu 's regime in South Vietnam. He called for all political factions to create a free,  neutral , peace-loving government which would resolve the tense situation that had taken form in the country. 
In 1982, Bảo Đại, his wife Monique, and other members of the former imperial family of Vietnam visited the United States. His agenda was to oversee and bless Buddhist and  Caodaiist  religious ceremonies, in the California and  Texas   Vietnamese-American  communities. 
 
Bảo Đại's burial place in the  Cimetière de Passy , Paris 
Bảo Đại died in a  military hospital  in Paris, France, on 30 July 1997. He was interred in the  Cimetière de Passy . 
Additional notes from other sources 
New Prince Regent of the Nguyen Dynasty 
In July 2004, in a solemn Bestowal of the Dragon Ring ceremony held in Washington D.C., Nhiep Chinh Nguyen Phuc Buu Chanh of Vietnam was anointed the new Prince Regent, His Imperial Highness Prince Regent of Imperial Nguyen Dynasty of Vietnam. [Source:  imperialvietnam.net  *+*] 
The Most Venerable Hòa Thng Thích Giác Minh presented His Imperial Highness Prince Nhiep Chinh Nguyen Phuc Buu Chanh of Vietnam with the Imperial Nguyen Family Dragon-Ring. This most treasured and sacred Imperial Family gold ring, formerly belonging to the late Emperor Khai Dinh. This scared ring was presented in the presence Her Imperial Highness Cong Nuong Princess Phan Lien, Respectable and Loyal Members of the Imperial Nguyen Family, Official and Honorable Guests, Respected Religious Venerables, Respected and Imperial Dignitaries, High-Ranking Military Officials and Members of the Vietnamese Diaspora. *+* 
The Dragon Ring - customarily presented by the Dowager Empress to the Anointed Successor to the Throne - had long been entrusted to the custody of the Most Venerable Hoa Thng Thich Giac Minh by the Dowager Empress Doan Huy Hoang Thi Hau Tu Cung, who was the Consort of the late Emperor Khai Dinh, and the mother of Vietnam's last Reigning Monarch, the late Emperor Bao Da