Medici Bank

This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.

Raymond de Roover's landmark study of the Medici Bank shows an institution solving problems no regulator had yet named. The Catholic Church's prohibition on usury, charging interest on a loan outright, meant the Bank could not simply lend money at a stated rate the way a modern bank does. Its bankers instead relied heavily on the bill of exchange, a financial instrument that let the Bank profit from the exchange-rate difference between currencies across its branches in Florence, Rome, Venice, Bruges, London and elsewhere, structuring what was economically a loan as a currency transaction the Church could not easily condemn. The Medici also refined double-entry bookkeeping practices already emerging in Italian commerce, keeping separate ledgers for each branch, organized as semi-independent partnerships under the Florence headquarters rather than a single centralized firm, which let the Bank contain a branch failure rather than letting it sink the whole enterprise, at least in principle. Its most politically valuable client was the Papacy itself: the Bank served as the Pope's chief banker for decades, managing Church revenue across Europe, a relationship that brought enormous profit and prestige and, eventually, enormous risk when a client that powerful could not simply be sued for a bad debt.

This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.

The same closeness to power that made the Medici Bank rich eventually helped ruin it. De Roover's account documents how the Bank's branches increasingly extended large, poorly secured loans to European rulers, most damagingly the English crown under Edward IV and various Burgundian dukes, credit extended partly for ordinary business reasons and partly because the Medici family had become Florence's de facto political rulers and used the Bank's resources to buy influence, including support for favoured candidates in Papal elections and Church politics more broadly. When royal debtors defaulted, as the English crown notoriously did, individual branches took losses the semi-independent partnership structure was supposed to contain, but bad management by branch managers appointed more for loyalty than competence, especially at the London and Bruges branches in the Bank's later decades, let losses compound rather than stay isolated. Political instability in Florence itself, including the Medici family's temporary expulsion in 1494, removed the political protection that had shielded the Bank from the consequences of its own overreach. By the last years of the fifteenth century the Bank that had once financed Popes and financed the Medici's own rise to power in Florence collapsed under debts it could not collect and losses it could not contain, a cautionary case study, in de Roover's reading, of a financial institution that let political ambition outrun banking discipline.