King John V of Portugal reigned from 1707 to 1750. He is known for his lavish lifestyle and significant contributions to the arts and architecture in Portugal. His reign saw the construction of many grand buildings, including the famous Mafra National Palace, which reflects the Baroque style. John V was also a patron of the Jesuits and supported the expansion of the Portuguese Empire in the Americas and Asia. His rule was marked by relative peace and prosperity, but he faced challenges such as financial difficulties due to his extravagant spending and the need for military reforms.