Marquis Yasumasa Matsudaira (松平 康昌, Matsudaira Yasumasa; 12 November 1893 – 4 January 1957) was a Japanese courtier who served as Grand Master of Ceremonies from 1947 to 1957. He was a close aide to Emperor Hirohito.
Source: “Yasumasa Matsudaira”, English Wikipedia (CC BY-SA 4.0), excerpt