What structure served as the warm room of a Roman bathhouse, ideal for relaxation and oil massage?

The structure that served as the warm room of a Roman bathhouse, ideal for relaxation and oil massage, is the tepidarium. This room was specifically designed to be warm and comfortable, facilitating a transition from the hotter caldarium (hot room) to the cooler frigidarium (cold room). Patrons of the bathhouse could enjoy the tepidarium to relax and prepare their bodies for the subsequent treatments, including massages, which often incorporated oils.

The tepidarium's environment was intentionally maintained at a moderate temperature, providing a soothing atmosphere that encouraged social interaction and rest, making it an essential part of the bathing experience in ancient Rome. The caldarium would be too hot for leisurely activities, while the frigidarium would be too cold for relaxation. The palaestra, on the other hand, was an exercise area rather than a bathing room, serving a different purpose in the complex.