Jean-Baptiste Le Moyne de Bienville, also known as Sieur de Bienville, was a French-Canadian colonial administrator in New France. Born in Montreal, he was an early governor of French Louisiana, appointed four separate times during 1701–1743. He was the younger brother of explorer Pierre Le Moyne d'Iberville.

The Old Mobile Site was the location of the French settlement La Mobile and the associated Fort Louis de La Louisiane, in the French colony of New France in North America, from 1702 until 1712. The site is located in Le Moyne, Alabama, on the Mobile River in the Mobile-Tensaw River Delta. The settlement served as the capital of French Louisiana from 1702 until 1711, when the capital was relocated to the site of present-day Mobile, Alabama. The settlement was founded and originally governed by Pierre Le Moyne d'Iberville. Upon the death of d'Iberville, the settlement was governed by his younger brother, Jean-Baptiste Le Moyne de Bienville. The site can be considered a French counterpart to the English colonial settlement at Jamestown, Virginia. The settlement site and fort were listed on the National Register of Historic Places on May 6, 1976. The Old Mobile Site was determined eligible for designation as a National Historic Landmark on January 3, 2001.