Events from 1421

Giovanni de' Medici's bank uses double-entry bookkeeping to manage branches from London to Constantinople

Genoa develops accomandita partnership form - sleeping partners with limited liability, active partners with unlimited liability

Dragon of Mount Pilatus seen - cooper encounters dragon on Mount Pilatus, survives by staying still (Swiss chronicles)

Birth of Henry VI - born at Windsor while father conquering France, will lose all his father won