This study examines the role of cross-cultural marriages in shaping commercial diplomacy and economic integration within Eurasian port cities from the early modern to the late colonial period, arguing that such marital alliances between European merchants and Asian or intermediary communities functioned as strategic institutions embedded within Eurasian maritime trade networks. The findings show that cross-cultural marriages emerged most frequently in high-intensity trade zones where cultural contact, merchant mobility, and institutional uncertainty were greatest, and were actively facilitated by Portuguese, Dutch, British, and Asian merchant communities operating within overlapping commercial systems. The study finds that these marriages significantly strengthened commercial diplomacy by producing kinship-based trust networks that reduced transaction costs, enabled informal credit systems, and sustained long-distance trade partnerships across generations, often substituting for weak or inconsistent formal legal enforcement. The paper also reveals that marital alliances created multilingual intermediary groups who played a decisive role in mediating negotiations between European trading companies and Asian merchant networks, thereby stabilizing commercial exchange in politically fragmented port environments. Socio-cultural analysis shows that religion, ethnicity, and colonial legal frameworks shaped marriage patterns through conversion requirements, ethnic hierarchies, and plural legal systems that regulated intermarriage, legitimacy, and economic outcomes. The findings reveal that cross-cultural Eurasian marital networks sustained economic integration, built trust, and supported Eurasian maritime trade by linking families, markets, and empires through durable kinship structures across centuries.
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