Montesquieu’s father, Jacques de Secondat, belonged to an old military family of modest wealth that had been ennobled in the 16th century for services to the crown, while his mother, Marie-Françoise de Pesnel, was a pious lady of partial English extraction. She brought to her husband a great increase in wealth in the valuable wine-producing property of La Brède. When she died in 1696, the barony of La Brède passed to Charles-Louis, who was her eldest child, then aged seven. Educated first at home and then in the village, he was sent away to school in 1700. The school was the Collège de Juilly, close to Paris and in the diocese of Meaux. It was much patronized by the prominent families of Bordeaux, and the priests of the Oratory, to whom it belonged, provided a sound education along enlightened and modern lines.
Charles-Louis left Juilly in 1705, continued his studies at the faculty of law at the University of Bordeaux, graduated, and became an advocate in 1708; soon thereafter he appears to have moved to Paris in order to obtain practical experience in law. He was called back to Bordeaux by the death of his father in 1713. Two years later he married Jeanne de Lartigue, a wealthy Protestant, who brought him a respectable dowry of 100,000 livres and in due course presented him with two daughters and a son, Jean-Baptiste. Charles-Louis admired and exploited his wife’s business skill and readily left her in charge of the property on his visits to Paris. But he does not appear to have been either faithful or greatly devoted to her. In 1716 his uncle, Jean-Baptiste, baron de Montesquieu, died and left to his nephew his estates, with the barony of Montesquieu, near Agen, and the office of deputy president in the Parlement of Bordeaux. His position was one of some dignity. It carried a stipend but was no sinecure.
The young Montesquieu, at 27, was now socially and financially secure. He settled down to exercise his judicial function (engaging to this end in the minute study of Roman law), to administer his property, and to advance his knowledge of the sciences—especially of geology, biology, and physics—which he studied in the newly formed academy of Bordeaux.