The history of his early married life vies in obscurity with that of his youth.

His biographers are not agreed among themselves; and in the same degree that he lays open to our view all that concerns his secret thoughts, the innermost mechanism of his mind, he observes too much reticence in respect to his public functions and conduct, and his social relations.

The title of Gentleman in Ordinary to the King, which he assumes, in a preface, and which Henry II.

gives him in a letter, which we print a little farther on; what he says as to the commotions of courts, where he passed a portion of his life; the Instructions which he wrote under the dictation of Catherine de Medici for King Charles IX., and his noble correspondence with Henry IV., leave no doubt, however, as to the part which he played in the transactions of those times, and we find an unanswerable proof of the esteem in which he was held by the most exalted personages, in a letter which was addressed to him by Charles at the time he was admitted to the Order of St.Michael, which was, as he informs us himself, the highest honour of the French noblesse.
According to Lacroix du Maine, Montaigne, upon the death of his eldest brother, resigned his post of Councillor, in order to adopt the military profession, while, if we might credit the President Bouhier, he never discharged any functions connected with arms.

However, several passages in the Essays seem to indicate that he not only took service, but that he was actually in numerous campaigns with the Catholic armies.