This guy was a fraud. The story that he tells is only detailed enough to match the story I grew up with.

My grandmother's father came over with his children and wife in 1907 after a failed attempt on his life. He was the son of a Duke and Duchess of Poland, not a Prince. Russian soldiers sent by the Russian monarchy helped thwart potential threats and ultimately aided the family in escaping to the United States via Canada via Ireland or Germany. There were several lower level royals from Poland that were aided by Russian soldiers at that time. I imagine that this man was probably one of the Russian soldiers.

The biggest problem with his story is that there was only one Crown Prince of Poland, Prince Leon Radziwill. He was born in 1888 and died in Paris in 1859. He is well documented by the British monarchy. I'm afraid that you and Arlington National Cemetary (since they have it on the man's grave stone), along with many others, are victims of a hoax. This man was no more the Crown Prince Leon than was the woman that in Virginia that claimed that she was the Princess Alexandra of the Romanovs. I'm sure if there were a DNA test as there was for the phony Princess Alexandra, it would expose this deception. He may, like the Princess Alexandra, had told the lie for so long that he started to believe it himself.

In searching my geneology, I've learned that sometimes the lie is much less painful and way less colorful than the truth.