From the book:

Monsieur de Manerville, the father, was a worthy Norman gentleman, well known to the Marechael de Richelieu, who married him to one of the richest heiresses of Bordeaux in the days when the old duke reigned in Guienne as governor. The Norman then sold the estate he owned in Bessin, and became a Gascon, allured by the beauty of the chateau de Lanstrac, a delightful residence owned by his wife. During the last days of the reign of Louis XV., he bought the post of major of the Gate Guards, and lived till 1813, having by great good luck escaped the dangers of the Revolution in the following manner. Toward the close of the year, 1790, he went to Martinque, where his wife had interests, leaving the management of his property in Gascogne to an honest man, a notary's clerk, named Mathias, who was inclined to—or at any rate did—give into the new ideas. On his return the Comte de Manerville found his possessions intact and well-managed. This sound result was the fruit produced by grafting the Gascon on the Norman.