Eulalia Pérez de Guillén Mariné (1766? – June 11, 1878) was a Californio who was mayordoma of Mission San Gabriel Arcángel and grantee of Rancho del Rincón de San Pascual in the San Rafael Hills, in present-day Los Angeles County, California. She claimed to have been born in 1766, if so making her 112 years old at the time of her death in 1878, but her case has not been verified or fully proven. Life Early years Eulalia Pérez was born in Loreto, the capital on the Baja California Peninsula of the Las Californias Province in the Viceroyalty of New Spain (in what is today the modern Mexican state of Baja California Sur), to Diego Pérez of Salamanca, Spain and Antonia Rosalia Cotes (or Cota) thought to be mulatta. Macedonio Gonzalez, one of Eulalia's nephews, knew Antonia Cota as Lucia Valenzuela according to Eulalia's English born son-in-law and author Michael C. White, aka: Miguel Blanco. Diego Pérez was a ship captain, thought to come from Salamanca—family members have been unable to trace records of his commission through the Archivo General de Indias or in Loreto, which has been ravaged by hurricanes over the centuries. Her siblings were Teresa, Petra, Juana, Josefa, Bernardo, and León. According to family lore, Capitan Pérez taught his daughter how to read and write, a fact later important to her survival and eventual prominence. She married Spanish army Sergeant Miguel Antonio Guillén at age fifteen. He was in the company at the Presidio of San Diego. They moved from Baja about 1800—on foot in those days—to the garrison at the new Mission San Gabriel, with their children Petra, Rosaria, and Isidoro. Miguel died while later serving at the garrison at San Diego, leaving Pérez with several children. Misión San Gabriel Pérez managed to obtain employment at Misión San Gabriel, initially as cook and midwife for those such as Governor Pío Pico. She was eventually made "keeper of the keys" (mayor doma) of the mission itself. Victoria Reid, an Indigenous Californian, worked as her assistant for a time in her young age. Rancho del Rincon del San Pascual When she retired, Mexican Governor José Figueroa rewarded Pérez as the grantee of Rancho del Rincón de San Pascual with her husband Juan Mariné. Rancho San Pascual encompasses the present day cities of Pasadena, South Pasadena, and San Marino. This had been part of the homeland of the Tongva-Gabrieleño