About Demchugdongrub
Demchugdongrub, also known as Prince De, courtesy name Xixian, was a Qing dynasty Chinese Mongol prince descended from the Borjigin imperial clan who lived during the 20th century and became the leader of an independence movement in Inner Mongolia. He was most notable for being the chairman of the pro-Japanese Mongol Military Government (1938–39) and later of the puppet state of Mengjiang (1939–45), during the Second Sino-Japanese War. In the modern day, some see Demchugdongrub as a Mongol nationalist promoting Pan-Mongolism, while others view him as a traitor and a pawn of the Japanese during World War II. After establishing a ceremonial Mengjiang-Manchukuo alliance in May 1935, Puyi honoured Demchugdongrub with the title of Martial Virtue Prince of the First Rank (武德親王 Wǔdé Qīnwáng). The Mengjiang United Autonomous Government (蒙疆連合自治政府 Méngjiāng Liánhé Zìzhìzhèngfǔ) was set up in 1939 with Demchugdongrub first being the vice-chairman, then the chairman. Demchugdongrub was a Chahar born into the Plain White Banner of the Eight Banners in Chahar Province during the Qing dynasty.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.