Durind the XIIIth century, Savoy’s county a thriving principality. It’s territorial development culminate in 1274, when la Bresse de l’Ain & la Dombes are definitvely annexed, by the marriage of county’s heir, Amédée, with Bâgé’s seigneury’s heir, whose dowry included most of castles of Bresse. The late XIIIth century was also a period of administrative strengthening, which took the form of a close control of detailed and justified chatelaine accounts. These documents of exceptional richness keep memory of all the expenses and revenues of the châtellenie on each accounting year, thus making it possible to reconstitute, at least partially, the architecture, the articulation and the function of the buildings, over a long time from the end of ...