Mariana Victoria of Spain, also known as Mariana Vitória, lived from March 31, 1718, to January 15, 1781. She was born as an Infanta of Spain and later became the Queen of Portugal as the wife of King Joseph I. Mariana Victoria played significant roles as regent of Portugal and advisor to her daughter, Maria I of Portugal, during her reign. Her life was marked by political alliances, diplomatic rifts, personal struggles, and a lasting impact on the history of Portugal.