I was reading an excerpt from The New York Times about the interring of the unidentified American serviceman in the Tomb of the Unknowns in 1921. There were quite a few officers from many countries that participated in World War I. One paragraph reads:
Tokugawa, Prince of Japan, last of the militant Shoguns, watched closely this occidental scene, which had all the elements of appeal to the Oriental imagination.
Who is "Tokugawa, Prince of Japan"? The last shogun was Tokugawa Yoshinobu, and he died in 1913. Were they referring to his son, Iesato?
I don't have any information on that specific event. However Tokugawa Iesato, who held the rank of prince (or koshaku), was one of Japan's representatives at the Washington Naval Conference (the others were Shidehara Kijuro and Admiral Kato Tomosaburo). That conference lasted from November 12th, 1921 through February 6th, 1922. So if your news article dates during or close to that time, Iesato is almost certainly the one being referenced.
The Tokugawa family were made high ranking nobility after the last Shogun stepped down, and some of them became high ranking military or diplomatic leaders. Another notable descendant of the last Shogun was his granddaughter, Tokugawa Kikuko, who married Hirohito's younger brother.