Spanish explorers traveling inland in the 16th century met Mississippian culture people at Joara, a regional chiefdom near present-day Morganton. Records of Hernando de Soto attested to his meeting with them in 1540. In 1567 Captain Juan Pardo led an expedition to claim the area for the Spanish colony and to establish another route to protect silver mines in Mexico. Pardo made a winter base at Joara, which he renamed Cuenca. His expedition built Fort San Juan and left a contingent of 30 men there, while Pardo traveled further, and built and garrisoned five other forts. He returned by a different route to Santa Elena on Parris Island, South Carolina, then a center of Spanish Florida. In the spring of 1568, natives killed all but one of the soldiers and burned the six forts in the interior, including the one at Fort San Juan. Although the Spanish never returned to the interior, this effort marked the first European attempt at colonization of the interior of what became the United States. A 16th-century journal by Pardo's scribe Bandera and archaeological findings since 1986 at Joara have confirmed the settlement.