From Classic Encyclopedia 1911
CESAREVICH, or more properly Tsesarevich, the title of the heir-apparent to the Russian throne. The full official title is Nasliednik Tsesarevich, i.e. " heir of Caesar," and in Russia the heir to the throne is commonly called simply Nasliednik, the word Tsesarevich never being used alone. Tsarevich, a form now much used in England, means simply any "king's son"; it is an antiquated term now out of use in Russia, and was last borne as heir to the throne by the unfortunate Alexius, son of Peter the Great. The style of the wife of the tsesarevich is Tsesarevna. The Cesarewitch handicap race at Newmarket, founded in 1839, was named after the prince who was afterwards Alexander II. of Russia, who paid a state visit to England that year.