The Saltykov family will no doubt be listed in one of Jacques Ferrands books of geneolgy...there are 2 exclusively on the Princes of the Russian Empire.
At the time of the revolution..the British Embassy was housed in a portion of the Saltykov Palace..while the family lived in the other part.The Ambassadoes daughter Meriel Buchanan remembered in her memoirs the elderly Princess "who died of want in the revolution".