Hypatia of Alexandria (Greek: Υπατία; born between 350 and 370 AD – 415 AD) was a Greek or Egyptian scholar, considered the first notable woman in mathematics, who also taught philosophy and astronomy. She lived in Roman Egypt, and was killed by a Christian mob who blamed her for religious turmoil. Hailed as a "valiant defender of science against religion", some suggest that her murder marked the end of the Hellenistic Age.

A Neoplatonist philosopher, she followed the school characterized by the 3rd century Plotinus, and discouraged mysticism - while encouraging logical and mathematical studies.

Hypatia travelled to both Athens and Italy to study, before becoming head of the Platonist school at Alexandria in approximately 400 AD, and would teach Plato and Aristotle to anybody willing to listen, including a number of Christians and foreigners who came to her classes.

Although Hypatia was herself a pagan, she was respected by a number of Christians, and later held up by Christian authors as a symbol of virtue. The Byzantine Suda controversially declared her "the wife of Isidore the Philosopher" but agreed she had remained a virgin.

Hypatia rebuffed a suitor by showing him her menstrual rags, claiming they demonstrated that there was "nothing beautiful" about carnal desires.

Hypatia maintained correspondence with her former pupil Bishop of Ptolomais Synesius of Cyrene. Together with the references by Damascius, these are the only writings with descriptions or information from her pupils that survive.

The contemporary Christian historiographer Socrates Scholasticus described her in his Ecclesiastical History as follows:

"There was a woman at Alexandria named Hypatia, daughter of the philosopher Theon, who made such attainments in literature and science, as to far surpass all the philosophers of her own time. Having succeeded to the school of Plato and Plotinus, she explained the principles of philosophy to her auditors, many of whom came from a distance to receive her instructions. On account of the self-possession and ease of manner, which she had acquired in consequence of the cultivation of her mind, she not unfrequently appeared in public in presence of the magistrates. Neither did she feel abashed in going to an assembly of men. For all men on account of her extraordinary dignity and virtue admired her the more."

Many of the works commonly attributed to Hypatia are believed to have been collaborative works with her father.

A partial list of specific accomplishments follows;

*A commentary on the 13-volume Arithmetica by Diophantus *Edited the third book of her father's commentary on Ptolemy's Almagest *Edited her father's commentary on Euclid's Elements *Edited a commentary that simplified Apollonius's Conics *She wrote the text The Astronomical Canon

Her contributions to science are reputed to include the charting of celestial bodies and the invention of the hydrometer, used to determine the relative density of liquids.

Her pupil Synesius wrote a letter defending her as the inventor of the astrolabe, although earlier astrolabes predate Hypatia's model by at least a century - and her father had gained fame for his treatise on the subject.

Believed to have been the reason for the strained relationship between the Imperial Prefect Orestes and the Bishop Cyril, Hypatia attracted the ire of a Christian population eager to see the two reconciled.

One day in March 415CE, during the season of Lent, her chariot was waylaid on her route home by a Christian mob, possibly Nitrian monks led by a man identified only as "Peter".

She was stripped naked and dragged through the streets to the newly christianised Caesareum church and killed. Some reports suggest she was flayed with ostrakois (literally, "oyster shells", though also used to refer to roof tiles) and set ablaze while still alive, though other accounts suggest those actions happened after her death.

Shortly after her death, a forged letter attacking Christianity was published under her name. The pagan historian Damascius, "anxious to exploit the scandal of Hypatia's death", laid the blame squarely on the Christians and Bishop Cyril.

In the 14th century, historian Nicephorus Gregoras descibed Eudokia Makrembolitissa as a "second Hypatia".

In the early 18^th-century, the deist scholar John Toland used her death as the basis for an anti-Catholic tract entitled "Hypatia: Or the history of a most beautiful, most vertuous, most learned, and every way accomplish’d lady; who was torn to pieces by the clergy of Alexandria, to gratify the pride, emulation, and cruelty of their archbishop, commonly but undeservedly stil’d St. Cyril. This led to a counter-claim being published by Thomas Lewis in 1721 entitled The History Of Hypatia, A most Impudent School-Mistress of Alexandria

Eventually, her story began to be infused with Christian details, as her story was first substituted for the missing history of Saint Catherine of Alexandria.

In the 19^th-century, interest in the "literary legend of Hypatia" began to peak.

Diodata Saluzzo Roero's 1827 Ipazia ovvero delle Filosofie suggested that Cyril had actually converted Hypatia to Christianity, and that she had been killed by a "treacherous" priest.

In his 1847 Hypatie and 1857 Hypatie et Cyrille, French poet Charles-Marie-René Leconte de Lisle portrayed Hypatia as the epitome of "vulnerable truth and beauty"

Charles Kingsley's 1853 fictionalized novel Hypatia - or New Foes with an Old Face, which portrayed the scholar as a "helpless, pretentious, and erotic heroine", recounted her conversion by a Jewish-Christian named Raphael Aben-Ezra after supposedly becoming disillusioned with Orestes.

In 1868, Julia Margaret Cameron produced a photographic depiction of the ancient scholar Hypatia.

The lunar crater Hypatia was named after the philosopher, in addition to craters named for Cyril and her father Theon. Measuring 28x41 kilometres, the crater is located 4.3°S and 22.6°E of the meridian. The 180km Rimae Hypatia, is located north of the crater, one degree south of the equater, along the Mare Tranquillitatis.

Despite her actual background, authors Soldan and Heppe wrote a text in 1990 arguing that Hypatia may have been the first famous "witch" punished under Christian authority.

*Feminist artist Judy Chicago included Hypatia in the First Wing of her work The Dinner Party. *The Heirs of Alexandria series written by Mercedes Lackey, Eric Flint and Dave Freer, includes fictitious references to Hypatia's conversion to Christianity and subsequent correspondence with John Chrysostom and Augustine. *Hypatia Cade, a precocious child and main character in the science fiction novelThe Ship Who Searched by Mercedes Lackey and Anne McCaffery is named after Hypatia of Alexandria. *Umberto Eco's novel Baudolino sees the protagonist meet a secluded society of satyr-like creatures who all take their name and philosophy from Hypatia. *Rinne Groff's 2000 play The Five Hysterical Girls Theorem features a character named Hypatia who lives silently, in fear that she will suffer the fate of her namesake. *Remembering Hypatia is a fictional treatment of her life and death by author Brian Trent. *Hypatia is a recurring character in Mark London Williams' juvenile fiction Danger Boy *Hypatia is the name of a 'shipmind' (ship computer), modeled after the historical Hypatia, in The Boy Who Would Live Forever, a novel in Frederick Pohl's Heechee series. *Hypatia Sans Pro is an Adobe typeface named after her. *The Corto Maltese adventure Fable of Venice, by characteristic superposition of anachronistic elements, sees Hypatia preside over an intellectual salon in pre-Fascist Italy. *Hypatia: A Journal of Feminist Philosophy has been published since 1986 by Indiana University Press

*Resources on Hypatia booklist, classroom activities
*Hypatia on ABC Radio Transcript of an interview with Dr Michael Deakin about his research on Hypatia, broadcast on Australia's ABC Radio National. Sunday, 3 August, 1997
*A collection of free high-resolution Hypatia-related images.
*Hypatia - Física, cultura y compromiso "Hypatia - Physics, culture and sense of duty" Spanish university association that defends science, knowledge, public university and public policies. (In Spanish)
*Holy Murder  a novel based on facts and real events about the murder of Hypatia of Alexandria