Julia Martinez de Estudillo was the wife of Jose Joaquin Estudillo. They were the founders of the City of San Leandro, California. They also built a hotel and donated several lots to the City. Their last home, located at 550 West Estudillo Avenue, is now California Historical Landmark No. 279 and is the site of St. Leander's Catholic Church, which owns this no-longer-active cemetery.

Per Huntington.org Baptism Records, http://missions.huntington.org/BaptismalData.aspx?ID=289:
Juana Maria del Carmen Martinez was baptized 31 May 1805 Mission Santa Barbara #00289. Father stated as Ygnacio Martinez, origin Ciudad de Mexico, military status cadete de la compañia del immediato Real Presidio de. Mother is stated as Maria Martina Arellanes, baptized Mission San Gabriel #01511X, origin Pueblo de los Angeles. Godparents are Maria Rafaela Arellanes, spouse Juan Ortega and Jose Maria Benitez, occupation ayudante consultor y cirujano 2o. Officiant and Recorder is Marcos Amestoy.

Per Huntington.org Marriage Records, http://missions.huntington.org/MarriageData.aspx?ID=27260:
Jose Juaquin Estudillo married Maria Juana Martinez 06 February 1823 Mission San Francisco de Asis #01993. Jose was baptized Mission San Carlos Borromeo
MBAP #02308, military status teniente de la misma compañia. Maria was baptized Mission Santa Barbara FBAP #00289. Jose's father is stated as Jose Maria Estudillo, origin Antequera en la antigua España, ciudad, and mother is stated as Maria Gertrudis Horcasitas, origin Mexico, natural de la ciudad. Maria's father is stated as Ygnacio Martinez, origin Ciudad de Mexico and mother is stated as Martina Arellano, baptized Mission San Gabriel #01511X, origin Pueblo de los Angeles en esta provincia. Witnesses are Luis Arguello and Maria Soledad Ortega. Officiant and Recorder is Thomas Estenaga.