The Roman Empire's expansion was facilitated not just by military conquest but by a sophisticated network of merchants, financiers, and intelligence operatives who prepared the ground for invasion by undermining local economies, corrupting leadership, and creating dependencies that made resistance increasingly difficult. Roman traders would establish themselves in target territories years before military campaigns, gathering intelligence about local resources, political divisions, and defensive capabilities while creating economic relationships that would benefit from Roman political control. These advance operations often proved more decisive than military campaigns in determining which territories could be successfully incorporated into the empire.
Medieval banking houses like the Medici and the Fuggers accumulated power that often exceeded that of the monarchs they served, using their financial leverage to influence succession disputes, territorial conflicts, and trade policies across Europe. These financial dynasties created international networks that could move money, information, and influence across political boundaries, often determining the outcomes of wars through their decisions about which sides to fund. The banking families developed sophisticated techniques for maintaining power across generations, including strategic marriages, religious patronage, and the cultivation of client relationships among nobility and clergy.