Researchers with roots in South Texas and northeastern Mexico often begin with Catholic parish registers, civil registrations, census records, and land grants. These are essential sources, but they represent only part of the surviving historical record.
If your ancestors lived in Spanish or Mexican Texas before 1836—or interacted with its government, military, missions, settlements, or commercial networks—the Bexar Archives deserve a place in your research plan.
The Bexar Archives are the official Spanish and Mexican records accumulated in San Antonio de Béxar when the city served as the capital of Spanish Texas and later as a departmental capital under Mexico. Today, the collection is preserved by the Dolph Briscoe Center for American History at the University of Texas at Austin.
The collection contains approximately 300,000 pages documenting Spanish Texas from 1717 to 1821 and the Mexican Department of Béxar from 1822 to 1836. According to the Briscoe Center, roughly half of the collection comes from the Mexican period. Explore the Bexar Archives Online.
These documents were created for government and administrative purposes—not for genealogists. Nevertheless, they can provide names, relationships, residences, occupations, military affiliations, legal conflicts, economic activities, and community connections unavailable in traditional vital records.
Why the Bexar Archives Matter to Borderlands Genealogy
Modern political boundaries can mislead researchers.
During the Spanish and Mexican periods, Texas was politically, economically, and socially connected to northern New Spain and later the Mexican states and provinces to its south. Government officials, military personnel, merchants, missionaries, settlers, messengers, prisoners, and families moved through networks extending between San Antonio, La Bahía, Laredo, Saltillo, Monterrey, and other communities.
The Briscoe Center explains that the collection documents both the Spanish province of Texas and the Mexican state of Coahuila y Texas. Its records concern the region’s political, diplomatic, religious, military, economic, and social life. Read the Briscoe Center’s collection overview.
This makes the archive particularly relevant to families with roots in:
- San Antonio de Béxar
- La Bahía and Goliad
- Nacogdoches
- Laredo
- The Nueces River region
- Coahuila
- Nuevo León
- Tamaulipas
- Other northern Mexican communities connected to Texas
Not everyone named in the records permanently resided in Texas. A person might appear because he delivered correspondence, joined a military unit, supplied livestock, gave testimony, requested permission to travel, participated in commerce, or became involved in a legal proceeding.
What Types of Information Can Be Found?
The Bexar Archives cover an unusually broad range of subjects. The Briscoe Center identifies materials concerning settlements, cattle raising, exploration, commerce, missions, military affairs, Indigenous relations, government administration, legal proceedings, smuggling, colonization, war, and revolution. Review the collection’s Texas history description.
For genealogists, several categories deserve special attention.
Censuses and population lists
Censuses may place an ancestor in a particular community at a specific point in time. Depending on the document, they may identify:
- Heads of household
- Spouses and children
- Soldiers and their units
- Civilian residents
- Servants or laborers
- Racial or social classifications
- Ages
- Occupations
- Property or livestock
The Briscoe Center’s online description illustrates the collection with Governor Domingo Cabello’s census of the province of Texas dated December 31, 1783. Separate surviving materials also include civilian and military census records for Béxar in 1779 and La Bahía in 1780. View the description of the 1779–1780 census materials.
A census entry should be compared with parish registers, military records, land documents, and later population lists. The same name appearing in several record groups provides stronger identification than one isolated entry.
Military records and correspondence
Military documents can be valuable because presidial soldiers and militia members were central to life in Spanish Texas.
These records may identify:
- A soldier’s name and rank
- Military company or post
- Assignment or transfer
- Pay or supplies
- Desertion or disciplinary action
- Participation in an expedition
- Family requests connected to military service
- The location of a unit at a particular time
A military reference does not necessarily constitute a complete service file. It may be a mention in a report, roster, letter, order, investigation, or financial document. Even a short reference, however, can place a person in a specific location and connect him to officers or fellow soldiers.
Legal proceedings
Legal records can reveal details that church records rarely contain.
The Bexar Archives include proceedings concerning theft, smuggling, desertion, violence, political disloyalty, and other alleged violations of Spanish or Mexican law. According to the Briscoe Center, the collection contains copybooks reporting trials and other judicial proceedings, as well as letters and legal papers created by officials and private individuals. Read the Briscoe Center’s account of the collection.
A legal file may include:
- Testimony
- Ages or estimated ages
- Residences
- Occupations
- Family relationships
- Neighbors and associates
- Travel routes
- Property descriptions
- Statements about earlier events
Remember that testimony represents what a person said or what an official recorded. Allegations are not automatically proven facts.
Petitions and government correspondence
People petitioned authorities for many reasons, including permission, compensation, protection, employment, military relief, supplies, land, or resolution of a dispute.
A petition can be genealogically useful because the petitioner needed to explain his or her circumstances. That explanation might identify a spouse, children, deceased relative, military service, residence, financial hardship, or connection to another community.
Official correspondence may also document ordinary people indirectly. A report about a settlement, expedition, epidemic, livestock shortage, or conflict could name residents who do not appear prominently elsewhere.
Commerce, livestock, and supplies
The borderlands economy depended heavily on livestock, transportation, military provisioning, and trade.
Records involving cattle, horses, supplies, debts, contracts, or commercial disputes may reveal:
- Ranching activity
- Ownership or control of livestock
- Business partnerships
- Suppliers to the presidio or government
- Debtors and creditors
- Transportation between settlements
- Economic relationships among families
This evidence can help distinguish two men who shared the same name. One may have been a soldier in Béxar, while another was a rancher supplying livestock from a nearby community.
Missions and Indigenous communities
The collection documents relations among civilians, soldiers, missionaries, missions, and Indigenous peoples. These records may provide context or direct references to individuals whose identities were simplified or altered in parish registers.
Researchers should approach colonial classifications carefully. Terms used by officials reflected the administrative and social attitudes of their era. They may not correspond to a person’s own identity or to modern tribal identities.
How to Search the Bexar Archives Online
The online collection is not a simple genealogy name index. It requires a combination of searching, browsing, and studying the archival descriptions.
Start with the Bexar Archives Calendar
An archival calendar is a chronological inventory containing brief descriptions of documents. It can help you determine which records may mention your ancestor, locality, military unit, or event.
The online calendar uses abbreviations describing the form of each item. For example:
- D.S. — Document signed
- L.S. — Letter signed
- E. — Expediente, which may contain multiple related documents
- F. — Fragment
- N.S. — Note signed
The Briscoe Center provides explanations for these abbreviations and calendars organized by microfilm roll. Browse the Bexar Archives Calendar.
An expediente can be especially valuable because it may contain a sequence of petitions, testimony, correspondence, and decisions rather than a single page.
Search every surname variation
Names in the collection were recorded in historical Spanish handwriting, summarized by archivists, and sometimes translated into English. Search variations that account for spelling and indexing differences.
For example:
- Béxar and Bexar
- González and Gonzalez
- Ximénez, Jiménez, and Giménez
- María Gertrudis and Gertrudis
- de la Garza and Garza
- José Antonio and Antonio
- San Fernando and Villa de San Fernando
Also search abbreviated and alternate given names. An individual identified as José María in one record could appear simply as José or María in another description.
Search places, offices, and military units
Your ancestor’s name may not appear in the calendar even when the underlying document mentions him. Descriptions cannot include every name found on every page.
Search for:
- The settlement
- Presidio or military company
- Mission
- Ranch or geographic feature
- Government office
- Commander’s name
- Known associate
- Event or conflict
Once you identify a promising group of documents, browse the relevant dates or microfilm roll.
Search relatives and associates
Apply cluster research to the archive. Search for your ancestor’s:
- Spouse
- Adult children
- Siblings
- In-laws
- Military commander
- Business partners
- Neighbors
- Known witnesses
An associate with an unusual surname may be easier to locate than the ancestor with a common name.
What Is Available Online?
The digital project provides document images, microfilm, descriptions, and selected scans from original materials. At present, the online originals-and-microfilm page says that rolls 8 through 30 are available online. These rolls cover materials from December 1717 through December 1802. The remaining chronological rolls are identified as available in microfilm format. Check the current online coverage.
Researchers should not interpret the limited online range as meaning later records do not exist. The full archive continues through 1836.
The collection can also be consulted in the Briscoe Center’s reading room. Approximately 250 volumes of translations are available there upon request. See the Bexar Archives access information.
The National Archives describes the microfilm edition as:
- 31 reels covering 1717–1803
- 38 reels covering 1804–1821
- 103 reels covering 1822–1836
- 26 reels of translations
View the National Archives description of the microfilm project.
Use the Name Index—but Do Not Stop There
The Bexar Archives have an extensive proper-name index, and the microfilm guide includes descriptions and name indexes. A digitized version of the three-volume guide is also identified through the FamilySearch Catalog. View the FamilySearch catalog entry.
A name index is a starting point, not a complete search.
A surname may be:
- Spelled differently
- Omitted from a calendar description
- Difficult to read
- Translated inconsistently
- Recorded under a title or military rank
- Hidden in an attachment within an expediente
After checking the index, search by date, place, unit, official, and associated family.
Build a Research Plan Before Diving In
The size of the collection can be overwhelming. Begin with a focused question.
Instead of asking:
Is my family somewhere in the Bexar Archives?
Ask:
Does the collection contain a census, military roster, petition, or legal proceeding that places José Antonio Garza in Béxar between 1780 and 1790?
Then create a short plan:
- Establish the ancestor’s known timeline.
- List every spelling of the name.
- Identify relatives and close associates.
- Search the name index and calendar.
- Browse the relevant dates and microfilm rolls.
- Record every potentially relevant document.
- Compare findings with parish, census, land, and notarial records.
Cite What You Find
An archival citation should let another researcher locate the same document.
Record:
- Name of the collection
- Series
- Document date
- Document description
- Item or archival number
- Microfilm roll
- Image number, when available
- Repository
- Stable URL
- Date accessed
Save the archival description and the document image. If you use a translation, identify it as a translation and consult the Spanish original whenever possible.
Documented Facts Versus Genealogical Interpretation
The Bexar Archives can generate compelling family-history leads, but researchers must distinguish evidence from interpretation.
For example:
- Documented fact: A 1791 document names Juan García as a soldier stationed at Béxar.
- Documented fact: A parish record identifies Juan García and María Pérez as the parents of a child baptized in Béxar that year.
- Interpretation: The soldier and the child’s father were the same person.
That interpretation may be correct, but it should be tested against age, rank, residence, spouse, associates, and other surviving records.
The archive is most powerful when combined with:
- Catholic parish registers
- Census records
- Land and property records
- Notarial documents
- Military files
- Local histories
- Records from northeastern Mexico
Additional Texas Research Support
The Texas State Library and Archives Commission maintains a Mexican American genealogy guide that points researchers to Bexar and San Antonio records as well as transcriptions from Spanish and Mexican archives dating from 1611 to 1833. It also notes that the Bexar Archives document the political, diplomatic, religious, military, economic, and social life of Spanish Texas and Coahuila y Texas. Explore the TSLAC Mexican American Genealogy Research Guide.
These related collections can help when a document mentioned in the Bexar Archives originated in Mexico City, Spain, Coahuila, or another government jurisdiction.
Final Thoughts
The Bexar Archives are not limited to famous officials, military commanders, or events surrounding the Texas Revolution. Their hundreds of thousands of pages also preserve glimpses of soldiers, settlers, ranchers, merchants, petitioners, witnesses, laborers, mission residents, and families.
For genealogists researching South Texas and northeastern Mexico, the collection offers something vital: a way to place ancestors inside the governmental, military, economic, and social world in which they lived.
The search may require more patience than entering a name into a conventional genealogy database. The reward can be far greater—a record that not only names an ancestor but explains what that person was doing, whom they knew, where they traveled, and how they participated in the history of the borderlands.
