Before the 19th century, the beings of European folklore were not charming. They were dangerous, morally ambiguous and frequently adult-sized. The narratives deal with abduction, changelings, debt, dilated time and the prohibition on eating in the Otherworld — a repertoire of risk, not of delight.
Liminality is the structural key: these beings inhabit thresholds — doorsteps, crossroads, dusk, mounds, water margins. They are not "supernatural" in the modern sense but neighbours from an adjacent territory with its own rules, negotiated through etiquette, offering and silence.
Domestication comes in three waves: Paracelsus's Renaissance learned classification, the Romantic collecting of the 18th and 19th centuries, and Victorian illustration fixing wings, tiny size and docility. Each wave erases part of the earlier material and is later read as if it were the original.
◇Iconographic evolution of fairies
From the 12th to the 19th century: seven centuries of Otherworld lady, fifty years of winged miniature.
XII–XIIIOtherworld LadyHuman-sized, richly dressed, bound to pact and prohibition. Wingless.
XIV–XVTrial subjectAbsorbed into demonological vocabulary; begins to appear in judicial testimony.
XVIClassified elementalParacelsus orders nymphs, sylphs, gnomes and salamanders by element.
XVII–XVIIICourt taleFrench salons turn the material into literature of morals and etiquette.
XIXWinged miniatureVictorian illustration fixes insect wings, tiny scale and childlike docility.