Answer: Medieval or Renaissance Europe
The knights, the horses, the flags, the castles, the fairies are all evocative of late Medieval and Renaissance Europe. As a matter of fact, art designer and creative director Jon Hench, with Walt Disney's approval, based the artistic style for "Sleeping Beauty" on the Flemish Hunt of the Unicorn tapestries (c. 1495) in The Cloisters museum, Fort Tyron Park, Washington Heights, New York City (managed by the Metropolitan Museum of Art, which received the tapestries in 1938). Hench's concept was developed by Kay Nielsen, who had made the initial sketches for the "Night on Bald Mountain" segment in "Fantasia" (1940). Eyvind Earl further developed the styling, colors, and background for "Sleeping Beauty" before leaving the project before its completion. Over their objections, animators were ordered by Walt Disney to conform to the realistic and flat and ironically modernist style, in a departure from earlier animated features.