Charles III was King of Spain in the years 1759 to 1788. He was also Duke of Parma and Piacenza, as Charles I (1731–1735); King of Naples, as Charles VII; and King of Sicily, as Charles III (1735–1759). He was the fourth son of Philip V of Spain and the eldest son of Philip's second wife, Elisabeth Farnese. He was a proponent of enlightened absolutism and regalism.

Enlightened absolutism, also called enlightened despotism, refers to the conduct and policies of European absolute monarchs during the 18th and early 19th centuries who were influenced by the ideas of the Enlightenment, espousing them to enhance their power. The concept originated during the Enlightenment period in the 18th and into the early 19th centuries. An enlightened absolutist is a non-democratic or authoritarian leader who exercises their political power based upon the principles of the Enlightenment. Enlightened monarchs distinguished themselves from ordinary rulers by claiming to rule for their subjects' well-being. John Stuart Mill stated that despotism is a legitimate mode of government in dealing with barbarians, provided the end be their improvement.