The arboretum is set beside the Lake Geneva (Lac Léman), within the medieval hunting grounds of the Counts and Dukes of Savoy which are now surrounded by high walls and cut through with a web of wide allées.
In turn for his support in the conflict with Count Odo II of Blois he received the northern Maurienne part of the County of Vienne, then a fief of the Vienne archbishops, as well as territories in the Chablais region and in the Tarentaise Valley, a fief of the Tarentaise archbishops at Moûtiers.
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Between the 11th century and the end of the 14th century, several parts of Arelat's territory broke away: Provence, Vivarais, Lyonnais, Dauphiné, Savoy, the Free County of Burgundy, and parts of western Switzerland.