Mission San Francisco de Asís or Mission Dolores, is the oldest surviving structure in San Francisco and the sixth religious settlement established as part of the California chain of missions. The Mission was founded on October 9, 1776, by Francisco Palóu and Fray Pedro Benito Cambón, both members of the de Anza Expedition, which had been charged with bringing Spanish settlers to Alta (upper) California and evangelizing among native american groups. The Mission was constructed of adobe and was part of a complex of buildings used for housing, agricultural, and manufacturing enterprises. Although much of the original layout of the complex has since been changed or modified the facade of the chapel has remained relatively unchanged. 