Tsarevitch Alexis Nicolarevitch (1904-1918) haemophiliac son of czar Nicolas II here c. 1912 [Getty Images]

UNSPECIFIED - NOVEMBER 22: Tsarevitch Alexis Nicolarevitch (1904-1918) haemophiliac son of czar Nicolas II here c. 1912 (Photo by Apic/Getty Images)

Hulton Archive Apic