A small pamphlet containing his Souvenirs 1848-1850 was published in 1901 by his brother Antoine Leon Philibert Auguste de Gramont, duc de Lesparre.
In Savoy and Piedmont, occupied by the French and claimed by Philibert Emmanuel, Charles V.s ally; in Navarre, unlawfully conquered by Ferdinand the Catholic and claimed by the family of Albret; in Italy, where, aided and abetted by Pope Paul III., Henry II.
The cause of Servetus was taken up by Calvin's Genevan foes headed by Philibert Berthelier, and became a test of the relative strength of the rival forces and of the permanence of Calvin's control.
He induced both France and Spain to evacuate the fortresses which they still held in Piedmont, made a profitable exchange of territory with the Bernese, and acquired an extension of seaboard by the purchase of Tenda and Oneglia (see Emmanuel Philibert of Savoy).
But the princes of the house of Savoy were a race of warriors; and what Emmanuel Philibert lost as sovereign he regained as captain of adventure in the service of his cousin Philip II.
In this struggle the syndic, Philibert Berthelier, succeeded in concluding (1519) an alliance with Fribourg, which, however, had to be given up almost immediately.
Emmanuel Philibert was succeeded by his son Charles Emmanuel I., who married Catherine, a daughter of Philip II.
Under Emmanuel Philibert Savoy lost all traces of constitutional government and became an absolute despotism of the type then predominating throughout the greater part of Europe.
When Emmanuel Philibert succeeded to his father Charles III.
As a statesman Emmanuel Philibert was able, business-like and energetic; but he has been criticized for his duplicity, although in this respect he was no worse than most other European princes, whose ends were far more questionable.