Tsesarevich was the title of the heir apparent or presumptive in the Russian Empire. It either preceded or replaced the given name and patronymic.
Image: Constantine Pavlovich by P.E.Rockstuhl (c.1809, Hermitage)
Image: Alexander II young
Image: Nicholas Alexandrovich, Tsarevich of Russia 2
Alexei Nikolaevich was the last Tsesarevich. He was the youngest child and only son of Emperor Nicholas II and Empress Alexandra Feodorovna. He was born with haemophilia, which his parents tried treating with the methods of peasant faith healer Grigori Rasputin.
Alexei as an infant in 1904
Alexei (right) with his sailor nanny Andrei Derevenko aboard the Imperial yacht Standart in 1908
The former palace of Russian emperors in the Polish Białowieża Forest, where Alexei had a particularly grave crisis, early October 1912