In 1416 the Duchy of Savoy was organized around castles, which were grouped into bailiwicks. There are thus thirteen bailiwicks or equivalents and some 175 castellani1,2, including:

The Bailiwick of Savoy (18 Chatelaines), consisting of Savoy Proper, Maurienne and Terentaise, with Chambéry as its capital, was the capital of the duchy until 1563;
Bailiwick of Bougie (3 Chatelaine), seat: Roussillon (castle) replaces the old strategic town of Saint-Rambert-en-Bugie, then replaced by the bailey
The Bailiwick of Val d’Oeste (5 Chatelaines), seat: Aosta (Tower of the Bailiwick)
The Bailiwick of the Val de Suisse with the Canaves (3 Chatelaines)
The Bailiwick of Chablais (16 Chatelaines), Headquarters: Château de Chillon
Bailiwick of Pays de Vaud (about 8 châtelnies depending on the period), Headquarters: Moudon (château). In 1456, it became a privilege with 17 or 18 castellanis.
The Bailiwick of Fausigny (11 castles), seat: Châtillon (castle)
The Bailiwick of Bres (10 chattelries), Headquarters: Bourg
Bail of Pays de Gex, Head Office: Gex
Bail of Valbonnais, seat: Montluel (Lordship of Montluel)
Bail of the Land of Provence (County of Nice and New Land of Provence), Headquarters: Nice
Bail of Piedmont, seat: Pignerol
Bail of Genevois (County of Geneva), seat: Annecy (Château)
Viennese (9 Castellanies)
In the 18th century the Duchy of Savoy was divided into provinces, circles and communes:

Savoie Clean Province (Chambery)
Maurian Province (Saint-Jean-de-Maurienne)
Tarentaise Province (Moutiers)
Province of Geneva (Annecy)
Faucigny Province (Bonville)
Chhablai Province (Thonon)