When we think of St. Patrick’s Day, we think of shamrocks, parades, and maybe a good stout. But long before most of the western world adopted the typical revelry associated with St. Patrick’s Day (and Ireland by default), Ireland had provided the world something surprisingly modern: a sophisticated system for guaranteeing promises – – suretyship.
Ancient Ireland operated under Brehon Law, a legal system that functioned for over a thousand years — without prisons, police forces, or centralized enforcement. If one wonders how people in this society made sure debts were paid and contracts were honored? They used sureties.










