Mariam al-Asturlabi, whose historical name is al-Ijliyya bint al-Ijli al-Asturlabi, was a 10th-century astrolabe maker from Aleppo in what is now northern Syria. In astronomy and related fields, the historical records kept just one woman’s name: al-Ijliya, an astrolabe maker. She is famous because she worked at the court of the Hamdanid ruler Sayf al-Dawla, and because she is the only woman Ibn al-Nadim lists among the instrument makers of her time. Her story is short, but it is worth telling carefully, because much of what is repeated online goes beyond the evidence.
Quick facts
| Full name | Al-Ijliyya bint al-Ijli al-Asturlabi (modern writers call her “Mariam al-Asturlabi”) |
| Born | Unknown (10th century, c. 900s) |
| Died | Unknown |
| Fields | Astrolabe making, applied astronomy, instrument craft |
| Most famous work(s) | Astrolabes made in Aleppo; no signed astrolabe by her is known to survive |
| Known for | Being the only woman named as an instrument maker in Ibn al-Nadim’s Fihrist; serving at Sayf al-Dawla’s court |
What is the astrolabe?
To understand her work, you first need to know the instrument. The astrolabe is an early scientific instrument used for reckoning time and for observation. The common planispheric type can be regarded as a rudimentary analog computer. It consists of stacked circular plates that rotate around the axis of a central pin.
The astrolabe was not invented by Muslims. It was originally an ancient Greek invention, which scientists and artisans in the Islamic world embellished and refined. This is important to say clearly, because some popular articles wrongly say she “invented” it. She did not, and no reliable source says so.
In Muslim lands the astrolabe had practical religious uses. It helped people work out the correct times and the direction to face for their daily prayers. With an astrolabe, observers could find local time, measure the height of stars, detect dawn, and determine the direction of Mecca.
Family and training
Our main evidence is a single line in al-Fihrist, the great catalogue of books and scholars by Ibn al-Nadim (d. 998). It lists al-Ijli al-Asturlabi, a pupil of Bitolus, “and his daughter al-Ijliya, who was with Sayf al-Dawla; she was the pupil of Bitolus.”
“Bitolus” is usually identified with Muhammad ibn Abd Allah Nastulus, a Baghdad craftsman. He is known for making one of the oldest surviving astrolabes, dated 927/928. So al-Ijliyya belonged to a real workshop tradition: her father and she both learned from the same master. Muslim Heritage notes that her father and several other scholars in Ibn al-Nadim’s list were apprentices to this same master.
Her name tells us something too. “al-Ijli” comes from the tribe of Banu Ijl, and “al-Asturlabi” simply means “the astrolabe maker”. It works like a job title, not a personal name.
At the court of Sayf al-Dawla
Al-Ijliyya worked in Aleppo under the Hamdanid emir Sayf al-Dawla. He reigned from 944 to 967. Muslim Heritage describes him as one of the powerful Hamdanid rulers who guarded the frontier with the Byzantine empire. His court in Aleppo was known as a centre of learning. For example, the astrologer al-Qabisi also went to Aleppo and lived in Sayf al-Dawla’s palace.
Many modern articles say the emir hired her because her designs were “intricate and innovative”. That sounds plausible, but it comes from later retellings. The old source says only that she was “with” Sayf al-Dawla, which historians understand to mean she worked at his court. We do not know her exact role. Ibn al-Nadim listed her only among makers of astronomical instruments, so we cannot say if she was an expert in other fields.
What we do not know
A good Islamic tradition of scholarship asks us to separate what is reported reliably from what is guesswork. Here is what is missing:
- Her birth and death dates. We do not know where she was born, or whether she learned instrument making in Aleppo or elsewhere.
- Her first name. The first name “Mariam” was provided by the Syrian Archaeological Society but remains to be corroborated. Ibn al-Nadim gives no first name.
- Any surviving instrument. Among the few extant Islamic astrolabes, none bears her name.
- Books by her. One writer mentions a work called “Corrections from Fatima” and a guide to using the astrolabe, but says no copy of the first has been found, and the second is only “allegedly” in a library. We should treat both as unverified.
Claims that she “changed astronomy forever” or “invented” navigation methods are therefore too strong. What history supports is more modest, and still remarkable: a woman was trained as a professional instrument maker in the 10th century and was valued enough to serve at a royal court.
Why her story matters
Making an astrolabe was demanding work. It took skill with metal tools and artistic design as well as science. The maker had to understand the mathematics of the sky and also engrave fine, accurate lines on brass. Muslim Heritage calls astrolabe making a branch of applied science of great status, so her place in that craft was a real achievement.
Her story also reminds us how much may be lost. Little information is available about her, and Ibn al-Nadim’s Fihrist is the only known source that mentions her. Scholars suggest that unedited manuscripts may hold more, and that careful research could still bring more women of knowledge to light.
Legacy
Her verified legacy is symbolic but real:
- An asteroid carries her name. The main-belt asteroid 7060 Al-‘Ijliya, discovered by Henry E. Holt at Palomar Observatory in 1990, was named in her honour. The naming citation was published on 14 November 2016.
- Recognition by 1001 Inventions. She was named an extraordinary woman of the Islamic Golden Age by 1001 Inventions.
- Inspiration in modern fiction. The author Nnedi Okorafor has said she learned about her at a book festival in the UAE, and TRT World links her to the novella Binti. Fiction is not history, but it shows how her name has reached new readers.
Frequently asked questions
Did Mariam al-Asturlabi invent the astrolabe?
No. Astrolabes can be traced to the 6th century AD, and the idea comes from the Greek world. She was a skilled maker in the Islamic tradition that refined it.
Was her name really Mariam?
Uncertain. The historical source calls her only al-Ijliyya, “the daughter of al-Ijli”. “Mariam” is a modern popular name that, according to Muslim Heritage, still needs to be confirmed.
When and where did she live?
She lived in the 10th century in Aleppo, and served at the court of Sayf al-Dawla, who ruled from 944 to 967. Her exact birth and death dates are not known.
Read more: Browse the full series at Great Muslim Scientists, and see our earlier posts Al-Battani (Albategnius): The Astronomer of Raqqa Who Corrected Ptolemy and Fatima al-Fihri: The Muslim Woman Who Founded the World’s Oldest University.
Sources: Muslim Heritage, “Early Women of Science, Technology, Medicine and Management”; Muslim Heritage, “Miriam al-Asturlabi”; Britannica, “Astrolabe”.
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