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BULGARIA - JANUARY 01: The king of Bulgaria BORIS III holding his son, crown Prince SIMEON, aged 1, in Bulgaria in 1938. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

BULGARIA - JANUARY 01:  The king of Bulgaria BORIS III holding his son, crown Prince SIMEON, aged 1, in Bulgaria in 1938.  (Photo by Keystone-France/Gamma-Keystone via Getty Images)