 Two years later, on June 3, 1748, he was appointed the interim governor of Texas.He unsuccessfully opposed the location chosen by the friars for Mission San Xavier del Bac.However, In June 1749, Junco y Espriella spoke with Juan Galván, an explorer who led the Mission San Xavier del Bac, to devise a plan to organize an expedition in the valley of San Javier (San Gabriel).