The Verdugo Mountains were named for Jose Maria Verdugo, holder of the Rancho San Rafael land grant, which covered the mountains during California's Spanish and Mexican periods. On October 20, 1784 Pedro Fages, the military governor of Alta California, granted Jose Maria Verdugo permission to use the rancho, known officially by the name San Rafael but informally called La Zanja by Verdugo. The rancho's boundaries were primarily defined by the Verdugo Mountains, the Arroyo Seco and the Los Angeles River, with the boundary following north along the east bank of the river and wrapping westerly around Griffith Park to a point near the Travel Town Museum in the park.