Spanish governor of Las Californias (1777–1782); considered a founder of Los Angeles and San Gabriel.
Junípero Serra (1713–1784) founded Mission San Gabriel Arcángel in 1771.
Don Antonio Yorba (1794–1858), prominent rancher and civic leader with vast San Gabriel Valley lands.
Benjamin D. Wilson (1825–1901) built the first irrigation system in the valley, enabling agricultural expansion.