Which term refers to a person who is both learned and exceptionally skilled in a particular area?

The term that refers to a person who is both learned and exceptionally skilled in a particular area is "savant." This word is derived from French, meaning "one who knows" or "learned," and is often used to describe individuals who have profound knowledge in a specific field, often paired with remarkable abilities or skills. In contexts such as the arts, sciences, or other areas of expertise, a savant is recognized not only for their knowledge but also for their exceptional talent or skill level, which sets them apart.

In contrast, the other terms do not align with this definition. "Ruffian" typically refers to a rough or scoundrel-like individual, lacking in scholarly or skillful attributes. "Sanctity" relates to a state of being holy or sacred, which doesn’t pertain to knowledge or skill. "Retinue" refers to a group of advisors or followers that accompany an important person, again lacking a direct connection to being learned or skilled in a particular area.