In September 1936, during the revolutionary atmosphere of the still early days of the Spanish Civil War Vivancos started learning Esperanto[3] by taking a course in the language organised by the Popular Encyclopaedic Athenium (Ateneo Enciclopédico Popular), the course instructor was Francesc Surinyac, a member of the Proletarian Esperanto Union of the Iberian and American Nations (Prolet-Esperantista Unio de Iber-Amerikaj Landoj) PUIL.
Vivancos and a group of Libertarian Youth at his Institute enthusiastically decided to volunteer for military service to defend the Republic.
[4] Despite his long period of internment Vivancos past some of the time by continuing to teach and correspond with other Esperantist inmates in the concentration camps of Le Vernet, Bram, Agde, Argelès etc.
After the end of World War II, Vivancos moved to Paris; while there, he met Ramona Comella the daughter of Spanish exiles.,[4][3] they would marry on 5 December 1945.
[4] Also while in Paris, Vivancos joined the World Anational Association (Sennacieca Asocio Tutmonda) or SAT[4] In those days, the Spanish Libertarian Movement began reorganising in France, a congress of the FIJL was organised and held in Toulouse in 1946 and one of its decisions was to create a committee to support the founding of an international organisation for young Anarchists.
[6] At the same time he became active in setting up the Esperanto language newspapers Black Flag (Nigra Flago)[2] and Anti-statist (Senŝtatano) becoming its editor.
Among some the more well known collaborators with Vivancos were Yamaga Taiji from Japan, Lu Chen Bo from China, Hartvig Johansson from Sweden and Eugene Lanti who was then living in Mexico.
[7] The relationship with Yamaga would prove especially fruitful, by using Yamaga's Esperanto translation of the Dao De Qing by the ancient Chinese philosopher Laoziu,[4] Vivancos created and published a Spanish translation of that work under the title "Libro del Camino y de la Virtud" in 1963.
After a 37-year exile, Vivancos was finally able to return to Spain in 1976[3] when the Francoist regime collapsed, there with great emotion he was able to reconnect with old comrades, friends and relatives.
Other visits followed, including one in 1986 to give a lecture on the 50th anniversary of the Spanish Revolution for the 59th SAT Congress in Sant Cugat del Vallès.
[14] In 2018 the North American Anarchist magazine Fifth Estate dedicated an English language article to him on the subject of Anarchism and Esperanto.
[16] In addition, a comprehensive article on his life appeared in the Canadian bulletin La Riverego (The River),[4] and SAT published his work in Sennaciulo and Sennacieca Revuo.