Rolin-Jaequemyns' reputation as an expert on international law was widely recognized. He became a member of several national academies, for example 1870 in Montreal, 1872 in Madrid, in 1874 in Belgium and 1881 in Constantinople. In 1877, the University of Edinburgh granted him the title of "Doctor Honoris Causa", and later he received the same distinction from the universities of Cambridge, Oxford and Brussels. In 1889 King Leopold II of Belgium appointed him member of the High Council for the independent state of the Congo Free State.