Ferdinand VI, called the Learned and the Just, was King of Spain from 9 July 1746 until his death. He was the third ruler of the Spanish Bourbon dynasty. He was the son of the previous monarch, Philip V, and his first wife Maria Luisa of Savoy.

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.