Gregor MacGregor, a charismatic Scottish officer who had fought in the Venezuelan War of Independence, returned to London in 1820 with an astonishing claim: he had been named Cazique (sovereign prince) of Poyais, a prosperous, resource-rich nation along Central America's Black River. MacGregor spun elaborate tales of a sparkling capital city named St. Joseph, complete with paved streets, grand government buildings, fertile soil yielding three harvests a year, and gold-filled rivers.
To make the fraud airtight, he published a detailed guidebook written under a pseudonym, established a fake legation in London, issued bogus Poyaisian land certificates, and printed native currency. Investors rushed to buy Poyaisian stock, and hopeful immigrants exchanged hard British currency for useless Poyais banknotes. In 1822 and 1823, seven ships carrying over 250 eager settlers set sail for the promised paradise.
Upon arrival, they found no city, no roads, and no civilization—only untouched, disease-ridden tropical jungle. Over two-thirds of the settlers perished from malaria, yellow fever, and starvation before Royal Navy ships rescued the survivors. Remarkably, MacGregor fled to France and attempted the exact same scam again, narrowly escaping severe punishment through continuous charm and legal maneuvering.