The Letter of Peace addressed to the United Nations was drafted by two Barcelonans Dr. Alfredo Rubio and Jose Luis Socias when they gave some conferences in Xian, China in March, 1989. They continued the draft for four years during which they organized more than a hundred meetings for dialogue and study in Barcelona and other cities of various countries, convening many professors and experts of Catalonia and the rest of Spain, and other countries of Europe, America, Africa and Asia.

The Letter of Peace was presented publicly for the first time in Barcelona on April 22, 1993, and thereafter it started to be disseminated in more than 80 countries over the five continents gathering thousands of signatures in most parts of the world.