He was born on 22 November 1922 in Rebola on Fernando Poo Island, where he began his primary studies to later graduate as a primary school teacher. In his youth he was assigned to the Río Muni Province to practice his profession in different locations, where he would also graduate in teaching. After his return to Fernando Poo, he dedicated much of his time to competing with the Spanish landowners in the exploitation of his family's cocoa plantations, to which he joined others on a lease basis.[7]
In October 1962, he was awarded the Silver Medal of the Order of Africa by Luis Carrero Blanco.[8]
Between August 1966 and April 1967 he became one of the main representatives of Bubi nationalism, as president of the Agrarian Chamber of Fernando Poo, while performing the function of procurator in the Cortes Españolas, since in the elections held in the Fernando Poo Province [es] on 16 November 1967 he obtained 4,125 votes out of 6,731 cast.[9] He participated in the Constitutional Conference [es] (1967–1968) that drafted the 1968 Constitution of Equatorial Guinea.
He was the first vice president[10] of the recently formed Republic of Equatorial Guinea, taking office on 12 October 1968. He maintained a strong friendship with President Macías.[11] After the establishment of the dictatorship in 1969, Bossio did not suffer any type of retaliation.[11] He frequently took charge of government functions when Macías traveled outside the country.[11]
On 2 March 1974, Bossio was removed from office and replaced by Miguel Eyegue.[12]
At the end of 1974, he was investigated by the Information Services (after an official portrait of Macías posted on the door of his home was destroyed)[12] and subjected to house arrest. According to allegations by the Guinean opposition in exile, the portrait incident was actually orchestrated by regime officials.[13] Bossio was arrested and summarily executed in the Black Beach prison on 21 February 1975. His death was officially justified as a suicide[4][12] by barbiturate overdose.[14]
Notes
^Sometimes spelled Edmundo Bosio Dioco.[2] Also sometimes known as Edmundo Dioco Bosio.
^(in Spanish)Revista La Guinea Ecuatorial, número 1.630, octubre-noviembre de 1968, página 24, Depósito Legal: F.P.-10-1959 (PDF).
^(in Spanish) Decreto 1849/1967, de 18 de agosto, por el que se convocan elecciones de Procuradores en Cortes representantes de la familia por cada una de las provincias. (BOE núm. 203, de 25 de agosto de 1967). [1]
^(in Spanish) En esa época Luis Sorizo cantaba por los pueblos de -todavía- Fernando Poo: «La independencia ha traído una novedad./¡Viva!/Bailemos por Guinea./Somos ya independientes./Es bueno, que el presidente haya sido Macías./El vicepresidente es Edmundo Bosió,/es bueno, que haya sido bubi.» en Mi voz y mi guitarra-El legado de Luis Sorizo. Irene Yambá Jora et José Francisco Eteo Sorizo, 2012.