Coahuila And Texas
COAHUILA AND TEXAS. In 1689–90 Alonso De León, governor of the Spanish province of Coahuila, extended his authority to include Texas. Early in 1691 he was succeeded by Domingo Téran de los Ríos, who was appointed governor of Coahuila and Texas. In 1693, however, Spain withdrew the Catholic missions from East Texas, and it was not until 1716 that Martín de Alarcón, who had been appointed governor of Coahuila in 1702, reextended his control over Texas. Alarcón was succeeded by the Marqués de Aguayo, whose activities resulted in the separation of the two provinces around 1726, during the time of his successor, Fernando Pérez de Almazán. The provinces were governed separately, with the capital of Texas at Los Adaes and that of Coahuila at Monclovaqv.
By the Constitution of 1824 the Mexican provinces of Nuevo León, Coahuila, and Texas were united as one state. Nuevo León was detached on May 7, 1824. A constituent congress was elected and assembled at Saltilloqv in August 1824, and a provisional governor was named for the state. A provisional chief was appointed for Texas in August 1824, and in December the Department of Texas was legally established as a subdivision of the state of Coahuila and Texas. The Constitution of Coahuila and Texas was adopted on March 11, 1827. The state was at first divided into three departments, but the number was eventually increased to seven: Saltillo, Parras, Monclova, Rosas, Bexar, Brazos, and Nacogdoches.
Full article on the Texas State Historical Association's Handbook of Texas Online