Jacob Levy Moreno, the well-known creator of psychodrama, had a close epistolary relationship with the Spanish psychiatrist Ramón Sarró; a collection of these letters has been located in the Sarró personal archive, deposited in the Library of Catalonia. After locating and arranging this correspondence, we proceeded to analyze and contextualize its contents. The analysis of this collection serves as a basis to outline the context in which the relationship between Moreno and Sarró developed, the role played by certain psychotherapy congresses in strengthening their relationships, and the process that resulted in the University of Barcelona awarding Moreno Doctor Honoris Causa. This study has allowed us to identify certain areas of how psychodrama was received in Spain during the 1960s and reflect on the creation of international collaboration networks and the creation of schools and professional and academic legitimation strategies in the wake of the approaches to group psychotherapy and psychodrama that Moreno developed while based in New York. (PsycInfo Database Record (c) 2022 APA, all rights reserved).