Gregor MacGregor, the man so Scottish they named him twice, led a successful military career, for three different countries before launching a naval war of his own against Spain. His feats of daring led him to the discovery of a lush tropical paradise, of which he became the ruling prince. The rest is Nonessential history. 

Sources:

Allen, Victor. Gregor MacGregor, Prince of Poyais. History Today. July 11, 2018. https://www.historytoday.com/miscellanies/gregor-macgregor-prince-poyais

Gregor MacGregor. Undiscovered Scotland. Last accessed on December 23, 2019. https://www.undiscoveredscotland.co.uk/usbiography/mac/gregormacgregor.html