Lilium martagon is widely-distributed throughout Europe and Asia. Common names in English include martagon lily and Turk’s-cap lily; Wikipedia notes: “martagon is a Turkish word which also means turban or cap”. In French, it is known as le lis martagon.
Incidentally, the French wikipedia page has more photographs of the species as well as notes about habitat, i.e., “In France, this species is found on wooded slopes, moist meadows, and pastures with rich and deep soils, preferably on calcareous soil, at an altitude of between 0 and 2800m (9000 ft.)”. The wide distributional range geographically and in elevation, plus large flowers on a statuesque inflorescence suggests an excellent garden plant. Indeed it is, having received an RHS Award of Garden Merit: Lilium martagon.