The expedition, led by Iberville, entered the mouth of the Mississippi River on the evening of 2 March 1699 (new style), Lundi Gras. They did not yet know it was the river explored and claimed for France by René-Robert Cavelier, Sieur de La Salle in 1683. The party proceeded upstream to a place on the east bank about downriver from where New Orleans is today, and made camp. This was on 3 March 1699, Mardi Gras, so in honour of this holiday, Iberville named the spot "Point du Mardi Gras" (French: "Mardi Gras Point") and called the nearby tributary Bayou Mardi Gras. Bienville went on to found the settlement of Mobile, Alabama in 1702 as the first capital of French Louisiana. In 1703 French settlers in Mobile established the first organised Mardi Gras celebration tradition in what was to become the United States. The first informal mystic society, or krewe, was formed in Mobile in 1711, the "Boeuf Gras Society". By 1720, Biloxi had been made capital of Louisiana. The French Mardi Gras customs had accompanied the colonists who settled there.