Claudius Aelianus, known as Aelian, was a Roman author and rhetorician of the late second and early third centuries CE. Born in the Italian town of Praeneste, he wrote exclusively in Greek and was a prominent figure in the Second Sophistic, a cultural movement that revered classical Greek language and learning. He served as a priest and was a friend of the historian Cassius Dio. Renowned for his eloquent Attic Greek, he earned the nickname "honey-tongued." Aelian famously claimed he never traveled beyond Italy, dedicating his life to study and writing in Rome.

His surviving works are compilations of stories and facts designed to entertain and educate. On the Nature of Animals is a 17-book collection of animal lore, blending natural history with moral fables. Various History is a 14-book miscellany of anecdotes about famous people, customs, and curiosities from the Greek world. He also wrote a surviving set of 20 fictional Rustic Letters about country life. Other works, including a speech titled Indictment of the Effeminate, are lost.

Modern scholars note that Aelian’s historical importance lies not in original analysis but in his role as a preserver. His writings are valuable repositories of excerpts from many earlier Greek texts that are now lost. They provide key insights into ancient beliefs, folklore, and the intellectual tastes of the educated, Greek-speaking elite within the Roman Empire.