COAHUILA. 
From about 1674 the early annals of Coahuila, or Reino de la Nueva Estre- 
madura, are inseparably interwoven with those of the Trans-Bravo country. 
From Saltillo, via Monclova, Bosque and the friars made their expedition 
across the Rio Grande. From Monclova as a base the settlement of eastern 
Texas by the Spaniards was begun. During the colonial period of Texas, 
Coahuila was an important source of supply of colonists, and Monclova, 
Santa Rosa, Rio Grande, and Saltillo were the bases of support for the fron- 
tier province. Santa Rosa was for a time the capital of all the Eastern In- 
terior Provinces, and Parras and Los Patos were the family seats of the 
powerful Aguayos. Many of the names prominent in mission and secular 
history are common to both provinces, as, for example, Massanet, Hidalgo, 
Olivares, De Leon, Teran, Azlor Virto de Vera, Barrios y Jauregui, Mar- 
tos y Navarrete, and Juan de Ugalde. Similar connection could be pointed 
out for the later period. Under the Spanish rule Texas and Coahuila were for 
a time under one governor and had a common capital, while many of the 
missions of both provinces were often under a single general administration. 
When the provinces became separated Coahuila still included part of what is 
now Texas. Under Mexican rule the uniting of Texas and Coahuila once 
more under a single government was one of the causes of the Texas revolu- 
tion. Since that event the frontier relations involving the two states have been 
close and highly interesting. 
SALTILLO. 
The Spanish villa (now city) of Saltillo dates from the sixteenth century. 
As has already been indicated, the place was for a long time a frontier settle- 
ment from which newer and more northern settlements were recruited. Espe- 
cially important in this respect was the adjacent Tlascaltecan pueblo of San 
Estévan. In the early days Monclova was usually the capital of Coahuila, but 
during recent times it has been at Saltillo, whither the provincial and state 
archives have been removed. Saltillo is also the seat of the diocese of Saltillo, 
established in recent years. 
ARCHIVO DE LA SECRETARIA DE GOBIERNO DEL ESTADO. 
(ARCHIVE OF THE SECRETARIAT OF GOVERNMENT OF THE STATE. ) 
As a consequence of the close connection of Coahuila with Texas through- 
out historical times, a connection which has already been pointed out, this is 
one of the most important local archives of Mexico for a study of the history 
of the United States. 
The larger part of the archive is arranged into expedientes, which are 
noted in the general indice, or inventory, called ‘ Registro de Expedientes ”. 
This inventory is in the main excellently made, and serves as a convenient 
guide to the larger part of the material in the archive. It can not be relied 
upon entirely, however, as a number of the documents are noted in it under 
wrong dates, while in other cases it is not sufficiently explicit to furnish the 
information desired by the investigator. The documents are arranged chrono- 
logically in legajos, and the same arrangement is followed in the indice. 
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