Grand Duke Peter Nikolaevich of Russia was a Russian Grand Duke and a member of the Russian Imperial Family.

Grand Duke Nicholas Nikolaevich of Russia was the third son and sixth child of Tsar Nicholas I of Russia and Alexandra Feodorovna. He may also be referred to as Nicholas Nikolaevich the Elder to tell him apart from his son, Grand Duke Nicholas Nikolaevich of Russia (1856–1929). Trained for the military, as a Field Marshal he commanded the Russian army of the Danube in the Russo-Turkish War, 1877–1878.