Unknown royal brides : This is Estelle Romanie Mainville, the american bride of Folke Bernardotte, count of Wisborg.1928
Folke was son of Prince Oskar of Sweden, son of his namesake, King Oskar II and Queen Sophie (nee pss of Nassau) and his commoner wife, Ebba Munck.
Sadly, Folke was assasinated in 1948 by members of a Zionist terrorist group called “Lehi”. He was UN mediator in Palestine
More about his life , here.