Cosimo III de' Medici, Grand Duke of Tuscany (died 1723)

Cosimo III de' Medici was Grand Duke of Tuscany from 1670 until his death in 1723, the sixth and penultimate from the House of Medici. He reigned from 1670 to 1723, and was the elder son of Grand Duke Ferdinando II. Cosimo's 53-year-long reign, the longest in Tuscan history, was marked by a series of laws that regulated prostitution and May celebrations. His reign also witnessed Tuscany's deterioration to previously unknown economic lows.

August 14 is the 226th day of the year in the Gregorian calendar; 139 days remain until the end of the year.