[Verginius Rufus]

I'm not sure if you are referring to Japan or France. The French royal family had a lot of members who died young, and tuberculosis seems to have been a major reason. There may be descendants of Louis Philippe around (I think Charles X's grandson, who would have become Henry V if they had restored the monarchy after the fall of Napoleon III, died childless).

King Juan Carlos of Spain is also descended from Louis XIV but perhaps his ancestor renounced any rights to the throne of France for his descendants, when he became Philip V of Spain in 1700.

[muawiyah]

No, I was referring to the Japanese royal line(s). Families keep track of this stuff. Old times there are not forgotten.