This article examines the Bengal-China connections between the Ilyās Shāhī and Ming dynasties in the early fifteenth century across the Bay of Bengal and South China Sea. It traces how law played a central role in the cultural geography and diplomatic vocabulary between individuals and communities in foreign lands, with their shared understanding of two nodal points of law. Diplomatic missions explicate how customary, regional and transregional laws were entangled in inter-imperial etiquette. Then there were the religious orders of Islam that constituted an inner circle of imperial exchanges. Between the Ilyās Shāhī rule in Bengal and the Ming Empire in China, certain dimensions of Islamic law provided a common language for the circulation of people and ideas. Stretching between cities and across oceans the interpolity legal exchanges expose interesting aspects of the histories of China and Bengal. © 2021 Brill Academic Publishers. All rights reserved.