They were the Romanovs...
The Czar, his immediate family, and the remnant of his entourage were all shot in 1918 in a basement near Ekaterinburg, now Sverdlov, at the southern end of the Urals, allegedly to prevent a White Russian (Czarist) army from capturing them. Stories about any survivors, especially Grand Duchess Anastasia, are likely false because all the bodies have been found, some very recently...
Most brothers and uncles of the Czar who weren't already dead perished.
Any who did escape left the vast majority of the family wealth behind them.
It was said that the Czar probably wouldn't have recognized the heir to the Russian throne, had he lived.
Most ended up in Paris and established an Emigre colony there.