During one of the congresses of the "Association Internationale pour le Progrès des Sciènces Sociales" ("International Association for the Progress of Social Sciences"), which he himself founded, he met the Dutchman Tobias Asser and the Englishman John Westlake and the trio decided to establish the "Revue de Droit International et de Législation Comparée" ("Review of International Law and Comparative Legislation"), a periodical dedicated to comparative law studies, the first academic journal in history devoted to international law. The first issue, edited by Rolin-Jaequemyns and with contributions from many noted scholars, appeared in late 1868.