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TheThesmophoria (Ancient Greek:Θεσμοφόρια, fromθεσμός (law) and-ῐος (-bearing)) was an ancient Greek religious festival, held in honour of the goddessDemeter and her daughterPersephone. It was held annually, mostly around the time that seeds were sown in late autumn – though in some places it was associated with the harvest instead – and celebrated human and agricultural fertility. The festival was one of the most widely celebrated in the Greek world. It was restricted to adult women, and the rites practiced during the festival were kept secret. The most extensive sources on the festival are a comment in ascholion onLucian, explaining the festival, andAristophanes' playThesmophoriazusae, which parodies the festival.

The Thesmophoria was one of the most widespread ancient Greek festivals.[1] The fact that it was celebrated across the Greek world suggests that it dates back to before the Greek settlement inIonia in the eleventh century BCE.[2] The best evidence for the Thesmophoria concern its practice inAthens, but there is also information from elsewhere in the Greek world, includingArcadia,[3]Sicily andEretria.[4]
The festival was dedicated to Demeter and her daughter Persephone[5] and was celebrated in order to promote fertility, both human and agricultural.[1] It was celebrated only by women, and men were forbidden to see or hear about the rites.[4] It is not certain whether all free women celebrated the Thesmophoria, or whether this was restricted to aristocratic women;[6] whichever was the case, non-citizen and unmarried women appear not to have celebrated the festival.[7] In fact, participation was expected of allAttic wives, and could serve as a form of proof of marriage.[8]
In Athens, the Thesmophoria took place over three days, from the eleventh to the thirteenth ofPyanepsion.[4] This corresponds to late October in theGregorian calendar, and was the time of the Greek year when seeds were sown.[9] The Thesmophoria may have taken place in this month in other cities,[10] though in some places – for instanceDelos andThebes – the festival seems to have taken place in the summer, and been associated with the harvest, instead.[9] In other places the festival lasted for longer – inSyracuse, Sicily, the Thesmophoria was a ten-day long event.[10]
The main source about the rituals of the Thesmophoria comes from a scholion onLucian'sDialogues of the Courtesans.[11] A second major source isAristophanes' playThesmophoriazusae;[12] however, Aristophanes' portrayal of the festival mixes authentically Thesmophoric elements with elements from other Greek religious practice, especially the worship ofDionysus.
Herodotus mentions the Thesmophoria in the second book of 'the Histories' and compares it to a similar Egyptian mystery ritual. He is vague about the practice and refuses to go into detail. However, he claims that the rite was introduced to thePelasgian women in Greece by the daughters ofDanaus, a mythical king of Libya. Herodotus further claims that knowledge of the Thesmophoria was nearly lost following ethnic cleansing of the Pelasgians by theDorians in thePeloponnese. He credits the Arcadians for the survival of the practice because of their survival of the cleansing.[13]

According to the scholiast on Lucian, during the Thesmophoria pigs weresacrificed, and their remains were put into pits calledmegara.[12] An inscription from Delos shows that part of the cost of the Thesmophoria there went towards paying for a ritual butcher to perform the sacrifices for the festival;[14] literary evidence suggests that in other places, however, the sacrifices may have been made by the women themselves.[15] Some time later, the rotten remains of these sacrifices were retrieved from the pits by "bailers" – women who were required to spend three days in a state of ritual purity before descending into themegara. These were placed on altars to Persephone and Demeter, along with cakes baked in the shape of snakes and phalluses.[16] These remains were then scattered on fields when seeds were sown, in the belief that this would ensure a good harvest.[12] According toWalter Burkert, this practice was "the clearest example inGreek religion of agrarian magic".[17]
It is not certain how long the remains of the pigs were left in themegara. The fact that they had decomposed by the time that they were retrieved shows that they had been left in the pits for some time. Possibly they were thrown in during one festival and retrieved the next year. However, if they were thrown in during the Thesmophoria and retrieved in time for the sowing of seeds that year, then they may have only been left for a few weeks before being taken out again.[15]
The first day of the Thesmophoria at Athens was known asanodos ("ascent"). This is usually thought to be because on this day the women celebrating the festival ascended to the shrine called the Thesmophorion.[18] Preparations for the rest of the festival were made on this day: two women were elected to oversee the celebrations. Women also set up tents on this day; they would spend the rest of the festival staying in these rather than at home.[11]
Matthew Dillon argues that the nameanodos is more likely to relate to the ascent of Persephone from the underworld, which was celebrated at the festival. Dillon suggests that a sacrifice to celebrate this ascent was performed on the first day of the festival.[18]
The second day of the festival was called thenesteia. This was a day of fasting,[18] imitating Demeter's mourning for the loss of her daughter.[11] On this day, the women at the festival sat on the ground on seats made of plants which were believed to beanaphrodisiac.[18] Angeliki Tzanetou says that ritual obscenity (Ancient Greek:αἰσχρολογία) was a feature of the second day of the festival;[11] however, Dillon says that the ritual obscenity would have taken place on another day, rather than the subdued second day,[12] and Radek Chlup argues that it took place on the third day of the festival.[19]
The third day of the Thesmophoria waskalligeneia, or "beautiful birth". On this day, women called upon the goddess Kalligeneia, praying for their own fertility. Plutarch notes that in Eretria the women did not call upon Kalligeneia during the Thesmophoria.[18]