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Member, California State Assembly, 2nd District, 1863-1865.
Los Angeles County Superior Court Judge∼Antonio Ygnacio Sepúlveda y Ávila was born at Los Ángeles, Alta California, México, in late June 1842. He was baptized at Mission San Gabriel on July 1, 1842, when he was only a few days old (SG Baptism 08523). He was the son of José Antonio Andrés Sepúlveda y Serrano, grantee of Rancho San Joaquín (Orange County), and María Francisca Paula Ávila y Ruíz. Ygnacio became a U.S. citizen following the invasion of Mexico and the subsequent transfer of California's sovereignty in 1848. Ygnacio grew up in Los Angeles, where he received his elementary education. A bright student, his parents sent him, along with his brother Andronico, to Boston, Massachusetts, where the brothers pursued studies in jurisprudence. They returned to California about 1858 to complete their legal studies (1860 US Census). Ygnacio was not yet 20 years old when he was admitted to the California State Bar. Running on the Democratic party ticket, he was elected in 1862 to represent the 2nd District in the California Legislature for the term 1863–65. Returning to Los Angeles, he was elected a county judge in 1869, and a district judge in 1874 or 1875 (sources vary). Judge Sepúlveda appears in the 1870 Census with his first wife, Ora Sepúlveda (maiden name unknown). Ygnacio was a member of the new Los Angeles Public Library system's first governing board in 1872. He became the second Superior Court judge for Los Angeles County in 1879 and held that post until he resigned in 1884 to accept a position as legal counsel for Wells-Fargo & Co. at Mexico City, Mexico. Before departing Los Angeles for his new position, Ygnacio, who was a widower by 1880, married (2) Herlinda de la Guerra y Sepúlveda on December 13, 1883. The couple left Los Angeles sometime after August 1884 to established a residence in Mexico City, as well as a successful law practice that flourished for the next thirty years. In 1895 President Grover Cleveland appointed him the "First Secretary and Chargé d'Affaires of the United States" in Mexico, a post he held until 1897. Also in 1895, Ygnacio was elected a member of the Mexican Academy of Jurisprudence and Legislation, and then appointed the academy's administrator by Mexico's President Porfirio Díaz. In the wake of the upheaval following the outbreak of Mexican Revolution in 1911, he returned to Los Angeles with Herlinda and daughter "Conchita" in 1914 to find a city greatly changed since his departure. He told a reporter: "I am constantly comparing myself to Rip Van Winkle, and there is a certain sadness in this coming back after thirty years. With the exception of a flying [quick, short] visit six years ago, I have not seen my old home in all that time. ...The disturbed conditions in Mexico were large factors in my decision to give up our home in that country."
Ygnacio died at his home on 2639 Monmouth Avenue, Los Angeles. A requiem mass was celebrated at Saint Agnes Church on December 5, 1916, with interment at Mission Santa Barbara.

(sources: National Archives and Records Administration, ancestry.com, Wikipedia, and personal family records)
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Children:
(with Ora)
- Ora A. (1871-1918; m. ..... Eaton)

(with Herlinda)
- María Concepción "Conchita" (1888-1972; m. [1] Charles H. Chapman on Nov. 11, 1916 in Alameda County, CA; m. [2] Prince Valeris Pignatelli on Mar. 26, 1928 in L.A. County, CA)