The Regency era is a sub-era within the Georgian period. During King George III’s reign, the monarch suffered from an often-debilitating mental illness. As his condition worsened, King George III’s son was made Prince Regent in 1811, giving name to the Regency era. The Regency officially lasted until his ascension to the throne as George IV in 1820. However, the entire late Georgian period is generally known as the Regency Era.