Life
Most contemporary depictions of witches are pretty charming in their own cliché way: Bette Midler and her cadre of long-sleeved cackling buddies in Hocus Pocus, the charming Kiki from Studio Ghibli classic Kiki's Delivery Service, or Angela Lansbury's utterly incompetent Eglantine Price from Bedknobs & Broomsticks (after which my own cat is named). But witches weren't always the broomstick-riding, black cat-loving figures of yore, a fact that many modern witches will happily explain to you. And if we go back past Salem, past the medieval period, and into truly ancient times, the first witches in ancient history were deeply terrifying supernatural creatures that could make even an emperor's blood run cold.
Over the centuries, the supernatural elements of witchery have accumulated other societal baggage, most of it patriarchal. Women in the medieval period were thought to be more vulnerable to the Devil's machinations because they were weaker in the brain, for instance: the most famous witch-hunting manual of all time, the Malleus Maleficarum of 1486, notes that "when a woman thinks alone, she thinks evil... through the first defect of their intelligence [women] are more prone to abjure the faith". If you're looking at the full picture of witch history, it's important to remember that through most of history, women were often branded witches for living outside of societal norms — not because they practiced magic. But these myths have a core of very real horror at their center. As one of the original things that went "bump" in the night, the witch's ancient origins might just scare the pants off you.
Roman Witches Were The Original Vampires — And Necrophiliacs
In this mythology, the strix had a particular target: children. Ancient Roman depictions of magic involved men as well, but elderly female witches specialized in murdering and torturing children, including those still in the womb, for spells. In their bird form, they offered their breasts to babies, and fed them poisoned milk. The ancient Germans believed in a similar phenomenon, and one of the earliest Germanic law books, the Lex Salica, included rules on what to do if a woman was found to have transformed into a creature that had eaten a man, and it was "proved against her."
The strix, besides being a cannibal, was prone to carrying off children for necromancy, using their body parts or blood for spells. A funerary inscription in Rome notes that a four-year-old slave belonging to the sister of the Emperor Claudius was "carried off" by a witch. They were even believed to devour living children whole. The only way to ward them off was to appease them with platters of pork, keep a watch on the cradle all night, and hang hawthorn everywhere. One particularly horrendous example, Erictho, who appears in the poetry of Roman poet Lucan and in Dante's Inferno, not only steals fetuses, she also has sex with corpses.
The idea of the blood-sucking night demon that can assume female form and threaten children has been pretty influential to many aspects of modern supernatural mythology. The strix is argued to have contributed to the long Eastern European tradition of beliefs in vampirism, and is also thought to be a precedent for the famous Slavic folkloric witch Baba Yaga, who is also a night-flier (in a mortar and pestle, rather than a broomstick) and devours young children. The ancient Judaic tradition also has a sister demon, Lilith, Adam's first wife, who was driven from Eden for not being obedient and became a child-devouring force of evil. (Lilith has since been reclaimed by second-wave feminists as a symbol of female equality because of her refusal to be subservient to Adam, hence the famous all-female Lilith Fair music festival). As cultures met, mingled and traded ideas about terrifying things that go bump in the night, the idea of the strix evolved and merged with other ideas — to ultimately form the cheesy image of a witch that is very much at odds with actual modern witches.