Mission Nuestra Senora de la Luz del Orcoquisac functioned as a Spanish religious outpost established in 1756 on the east bank of the Trinity River near present-day Wallisville in Chambers County, paired with the adjacent Presidio San Agustin de Ahumada as part of a combined complex known as El Orcoquisac. The mission's everyday purpose was to convert and minister to the Orcoquiza and Bidai peoples living along the coastal plain, while the presidio's garrison was meant to secure the area against French and, later, British commercial and territorial ambitions in the region. In practice the mission achieved only limited success, recording roughly thirty conversions over its operating years, and the low, swampy terrain made conditions difficult for both soldiers and missionaries. Both mission and presidio were abandoned around 1771-1772 as Spain consolidated its Texas holdings elsewhere, and the site was largely forgotten until the state placed a commemorative marker in 1936; archaeological excavations in the 1960s later confirmed its precise location, though little physical evidence of the Spanish occupation remains visible above ground. Today the site no longer serves any religious or defensive function; its historical use is as an archaeological site and commemorative landmark near Wallisville, documented by historical markers and studied as an example of Spain's short-lived eighteenth-century effort to hold the upper Texas Gulf Coast against rival colonial powers.