Among the ancient Greeks, Hecate or Hekate was originally a goddess of the wilderness and childbirth, who, over time, became associated with the practice of sorcery. Originally venerated as a mother goddess by the Greeks, the character of Hecate changed considerably, as her fertility and motherhood elements decreased in importance. Instead, she was ultimately transformed into a goddess of sorcery, who came to be known as the 'Queen of Ghosts', a transformation that was particularly pronounced in Ptolemaic Alexandria. It was in this sinister guise that she was transmitted to post-Renaissance culture. Today, she is often seen as a goddess of witchcraft and Wicca.
Hecate, like many of the other non-indigenous Greek gods (including Dionysus, Demeter, and Artemis), had a wide range of meanings and associations in the mythic and religious beliefs and practices of the ancient Hellenes. She, in particular, was associated with nature and fertility, the crossroads, and (later) death, spirits, magic and the moon. In the religious practices based upon her later characterization, much like the worship of Anubis (in Egyptian Mythology) and Hel (in Norse Mythology), veneration was prompted by a fundamental human drive: to control (or at least comprehend) our mortality. Since the Greek understanding of the afterlife was a rather dreary one (See Hades), Hecate's multifaceted personality was understandably complex leading to her later magical associations.
Hecate is known as a Greek goddess but worship of her originated among the Carians of Anatolia. Indeed, the earliest inscription describing the goddess has been found in late archaic Miletus, close to Caria, where Hecate is a protector of entrances.
As Hecate was a pre-Olympian chthonic goddess (and, as such, related to earth, fertility, and death), she was not easily assimilated into the Greek pantheon. Indeed, her representation in the mythic corpus is patchy at best, with many sources describing her in a very limited fashion (if at all). This situation is further complicated by the fact that her two characterizations (goddess of nature/fertility versus goddess of death, magic and the underworld) seem to be almost entirely disparate. Indeed, outside of Hesiod's Theogony, the classical Greek sources are relatively taciturn concerning her parentage and her relations in the Greek pantheon.
In Hesiod's masterful poem, he records that the goddess was the offspring of two Titans, Asteria and Persus. Further, he ascribes to Hecate such wide-ranging and fundamental powers, that it is hard to resist seeing such a deity as a figuration of the Great Goddess, though as a good Hellene, Hesiod ascribes her powers to a "gift" from Zeus:
His inclusion and praise of Hecate in Theogony is troublesome for scholars in that he seems fulsomely to praise her attributes and responsibilities in the ancient cosmos even though she is both relatively minor and foreign. It is theorized  that Hesiod’s original village had a substantial Hecate following and that his inclusion of her in the Theogony was his own way to boost the popularity of the local cult with an unfamiliar audience.
Despite her provenance as a Titaness, Hecate was acknowledged as an ally and friend of the Olympians. Indeed, she was thought to have been the only Titan to aided Zeus and the younger generation of gods in the battle of gods and Titans, which explains why she was not banished into the underworld realms after their defeat. In spite of the fact that no classical sources depicting the event have survived, it is attested to in considerable detail in both sculpture and pottery from the period (most namely, the majestic frieze on the altar at Pergamos. Additionally, as Hecate’s cult grew, her figure was added to the myth of the birth of Zeus as one of the midwives that hid the divine child, while Cronus consumed the swaddled rock deceitfully handed to him by Gaia.
Conversely, other sources describe her as the child of either Zeus and Asteria, Aristaios and Asteria, or even Zeus and Demeter. This final association likely arose due to a similarity of function, as both goddesses were related to earth and fertility.
In keeping with the extremely positive image of the goddess expounded upon in the Theogony, Hesiod also describes the multifarious and all-encompassing contributions that the goddess makes to the lives of mortal. As he suggests:
As in the case of her lineage, there are also multiple understandings of the mythic role(s) of the goddess. One lesser role subordinates Hecate to the goddess Artemis. In this version, Hecate is a mortal priestess who is commonly associated with Iphigeneia and scorns and insults Artemis, but is eventually driven to suicide. In a uncharacteristic gesture of forgiveness, Artemis then adorns the dead body with jewelry and whispers for her spirit to rise and become her Hecate, and act similar to Nemesis as an avenging spirit for injured women. Such myths, where a local god sponsors or ‘creates’ a foreign god, were widespread in ancient cultures as they allowed a syncretistic means of integrating foreign cults.and 
Similar to the herms of classic antiquity (totems of Hermes placed at borders as wards against danger), images of Hecate also fulfilled the same liminal and protective role. It became common to place statues of the goddess at the gates of cities, and eventually domestic doorways. Further, Hecate had a special role at three-way crossroads, where the Greeks set poles with masks of each of her heads facing different directions.  Eventually, this led to the depiction of the goddess as possessing three heads (or even three conjoined bodies (see below)).
The crossroad aspect of Hecate likely stems from her original sphere of influence as a goddess of the wilderness and untamed areas. This led to sacrifice in order for safe travel into these areas.
The later Roman version of this deity is as the goddess Trivia, "the three ways." Eligius in the seventh century reminded his recently converted flock in Flanders that "No Christian should make or render any devotion to the gods of the trivium, where three roads meet, to the fanes or the rocks, or springs or groves or corners," worship practices that had been common in his Celtic congregation.
Over time, the apotropaic associations with the goddess, specifically with respect to her role in driving away evil spirits, led to the belief that Hecate, if offended, could summon evil spirits. Thus, invocations to Hecate arose which characterized her as the governess of the borders between the mortal world and the spirit world .
In the modern imagination, Hecate is most often remembered as a chthonic goddess, associated with sorcery, necromancy and the mysteries of the dead. Indeed, Hecate was the goddess who appeared most often in magical texts such as the Greek Magical Papyri and curse tablets, along with Hermes. The transformation of the figure of Hekate can be traced to fifth-century Athens, as in two fragments of Aeschylus (ca. 525–456 B.C.E.) she appears as a great goddess, while in Sophocles (495-406 B.C.E.) and Euripides (480–406 B.C.E.) she has already become the mistress of witchcraft and keres. 
Eventually, Hecate’s power resembled that of sorcery. Medea, who was a priestess of Hecate, used witchcraft in order to handle magic herbs and poisons with skill, and to be able to stay the course of rivers, or check the paths of the stars and the moon.
These chthonic associations would developed through a relatively late affiliation with the tale of Persephone's abduction by Hades. Specifically, the Homeric Hymn to Demeter suggests that Hecate was one of the two gods (along with all-seeing Helios) who were witness to the young goddess's kidnapping, and who accompanies Demeter (the grieving mother) in her quest to return her daughter to the world of the living. When the two are finally reunited, they are described given due thanks to the shadowy goddess:
This connection with the world of the dead is even further established by the time of Vergil's composition of the Aeneid, which (in Book 6) describes the hero's visit to the Underworld. When visiting this grim twilight realm, the protagonist is apprised of the various tortures being visited on the souls of the impious and immoral dead, all under the watchful eye of Hecate.
The earliest depictions of Hecate are single faced, not triplicate. Summarizing the early trends in artistic depictions of the goddess, Lewis Richard Farnell writes:
The second-century traveler Pausanias stated that Hecate was first depicted in triplicate by the sculptor Alkamenes in the Greek Classical period of the late fifth century. Some classical portrayals, depict her in this form holding a torch, a key and a serpent. Others continue to depict her in singular form. Hecate's triplicity is represented in the vast frieze of the great Pergamon Altar, which depicts the Titanomachy (the mythic battle between the Olympians and the Titans). In the Argolid, near the shrine of the Dioscuri, Pausanias also tells of a temple of Hecate opposite the sanctuary of Eilethyia: "The image is a work of Scopas. This one is of stone, while the bronze images opposite, also of Hekate, were made respectively by Polycleitus and his brother Naucydes, son of Mothon."
In general, the representations of Hecate seem to follow a similar progression to the development of her cultic and mythic forms, evolving in tandem with the public conception of the goddess. Thus, as her characterization began to assume greater elements of the chthonic and the uncanny, visual representations followed suit.
As mentioned above, and in spite of the ubiquity of popular belief in the goddess, Hecate was not originally a Greek deity. Instead, the roots of her veneration seem to stem from the Carians of Asia Minor. More specifically, her most important sanctuary was Lagina, a theocratic city-state where the goddess was served by eunuchs, and was celebrated through sacrifices and festivals. At this temple, "the goddess was worshipped as sōteira, mēgiste, and epiphanestatē; her exalted rank and function here are unmatched in cults of Hecate elsewhere"  Moreover, this influence was such that she was also seen as the patroness of nearby Stratonikea. ;  The case for Hecate's origin's in Anatolia is bolstered by the fact that this is the only region where theophoric names incorporating "Hecate" are attested.
This type of organized temple observance is attested to in Hesiod's Theogony:
In Thrace, on the other hand, she played a role similar to that of lesser-Hermes, namely a governess of liminal points and the wilderness, bearing little resemblance to the night-walking crone that she became.
As her cult spread into other areas of Greece, it led to a theological conflict, as Hecate’s role was already filled by other more prominent gods in the Greek pantheon, above all by Artemis, and by more archaic figures, such as Nemesis. It was likely at this time that her associations with death and magic developed, as these were domains that were relatively under-represented in the Olympic Pantheon.
In this role, Hecate was seen as able to use her chthonic powers to deliver spiritual punishment to moral wrong-doers. Using "curse tablets," which were buried in the ground, supplicants requested the aid of the goddess in pursuing their interpersonal vendettas, many of which have subsequently been discovered through archaeological research. One example has been found that references a legal battle with an individual named Phrerenicus:
Further, this association with evil spirits led to an increase in her worship at the household level. For instance, one practice (poetically described as the banquet of Hekate) referred to "offerings made … to the mistress of spirits, in order to avert evil phantoms from the house. None of the household would touch the food." To this end, worshipers fearing the taint of evil or contagion would occasionally sacrifice a dog at the crossroads, also meaning to placate the "mistress of ghosts."
Hecate was worshiped by both the Greeks and the Romans who had their own festivals dedicated to her. According to Ruickbie, the Greeks observed two days sacred to Hecate, one on the 13th of August and one on the 30th of November, whilst the Romans observed the 29th of every month as her sacred day. Further, the household observances (described above) always took place on the "thirtieth day [of the month], which was sacred to the dead."
The figure of Hecate can often be associated with the figure of Isis in Egyptian myth, mainly due to her relationship with esoteric knowledge. In Hebrew myth, she is often compared to the figure of Lilith and to the Whore of Babylon, in later Christian tradition. Both were symbols of liminal points, with Lilith also playing a role in sorcery. She is also comparable to Hel of Nordic myth in her underworld function.
Before she became associated with Greek mythology, she had many similarities with Artemis (wilderness, and watching over wedding ceremonies) and Hera (child rearing and the protection of young men or heroes, and watching over wedding ceremonies).
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