Armengol is based on facts really happened during the Spanish Civil War in Badajoz, in Extremadura, where lived the character that gave its name to the theatrical opesra by Miguel Murillo, a native of the same place.
Armengol Sampérez (1882-1936) was an idealist who, in the Spanish province of the 1930s, opened a gym for boys studying and practicing a pedagogical method that is meant to improve the self-esteem of the young men group who met under his leadership.
The method tried to combine the development of the body with the mind growth without seeking to achieve goals absolute, proportioning them instead to the means that the boys had actually available.
In 1936 Armengol departed from Estremadura to go to Barcelona with a group of ten young men who were supposed to participate in the ''Olympics of the free world'', an organized event in antithesis with the Berlin Olympics of Nazi Germany.
The outbreak of civil war prevented the holding of Barcelona alternatives Olympics, while Armengol was imprisoned and sentenced to death.