House of Wisdom

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This article is about the medieval Abbasid Library, Baghdad.
For the ancient Fatimid university see Dar al-Hikmah.
Scholars at an Abbasid library. Maqamat of al-Hariri Illustration by Yahyá al-Wasiti, Baghdad 1237

The House of Wisdom (Arabic: بيت الحكمة‎; Bayt al-Hikma) was a library, translation institute and school established in Abbasid-era Baghdad, Iraq.1 It is considered to have been a major intellectual center during the Islamic Golden Age. The House of Wisdom was founded by Caliph Harun al-Rashid (reigned 786 - 809) and culminated under his son al-Ma'mun (reigned 813 - 833) who is credited with its formal institution. Al-Ma'mun is also credited with bringing many well-known scholars to share information, ideas and culture in the House of Wisdom. Based in Baghdad from the 9th to 13th centuries, many learned scholars including those of Persian or Christian background2 were part of this research and educational institute. Besides translating books into Arabic and preserving them, scholars associated with the House of Wisdom also made many remarkable original contributions to diverse fields.34

During the reign of al-Ma'mun, astronomical observatories were set up, and the House was an unrivaled center for the study of humanities and for science in medieval Islam, including mathematics, astronomy, medicine, alchemy and chemistry, zoology and geography and cartography. Drawing on Indian, Greek, and Persian texts, the scholars accumulated a great collection of world knowledge, and built on it through their own discoveries. By the middle of the ninth century, the House of Wisdom was the largest repository of books in the world.4

It was destroyed in the sack of the city following the Mongol Siege of Baghdad (1258).


Foundation and origins

The earliest scientific manuscripts originated in the Abbasid Era.

The preservation and development of human knowledge was a cherished tradition of the Eastern Christians and Persian Zoroastrians.5 During the 4th through the 7th centuries, scholarly work in the Greek and Syriac languages was either newly initiated, or carried on from the Hellenistic period. Centers of learning and of transmission of classical wisdom included colleges such as the School of Nisibis and later the School of Edessa, and the renowned hospital and medical academy of Jundishapur; libraries included the Library of Alexandria and the Imperial Library of Constantinople; and other centers of translation and learning functioned at Merv, Salonika, Nishapur and Ctesiphon situated just south of what was later to become Baghdad.67

The Umayyad Caliph Muawiyah I gathered a collection of books in Damascus that were already referred by the name "Bayt al-Hikma"4 and contained Greek and Christian books about medicine, alchemy and other disciplines.8 Remarkably, the Umayyads also appropriated paper-making techniques from the Chinese and joined many ancient intellectual centers under their rule, and employed Christian and Persian scholars to both translate works into Arabic, and to develop new knowledge.9 These were fundamental elements that contributed directly to the flourishing of scholarship in the Arab world.8

In 750, the Abbasid dynasty replaced the Umayyad as the ruling dynasty of the Islamic Empire, and, in 762, the caliph al-Mansur (r. 754 – 775) built Baghdad and made it his capital, instead of the old Damascus. Baghdad's location and cosmopolitan population made the perfect location for a stable commercial and intellectual center.8 The Abbasid dynasty had a strong Persian bent,10 and adopted many practices from the Sassanian Empire – among those, that of translating foreign works, except that now texts were translated into Arabic. For this purpose, al-Mansur founded a palace library, modeled after the Sassanian Imperial Library, and provided economic and political support to the intellectuals working there. He also invited delegations of scholars from India and other places to share their knowledge of mathematics and astronomy with the young Abbasid court.8

In the Abbasid Empire, many foreign works were translated into Arabic from Greek, Chinese, Sanskrit, Persian and Syriac. The Translation Movement gained great momentum during the reign of caliph al-Rashid, who, like his predecessor, was personally interested in scholarship and poetry.4 Originally the texts concerned mainly medicine, mathematics and astronomy; but, other disciplines, especially philosophy, soon followed. Al-Rashid's library, direct predecessor to the House of Wisdom, was also known as Bayt al-Hikma or, as the historian Al-Qifti called it, Khizanat Kutub al-Hikma (Arabic for "Storehouse of the Books of Wisdom").4

Under Al-Ma'mun

Physician learning a complex surgical method.

Under the sponsorship of caliph al-Ma'mun (r. 813 – 833), economic support of the House of Wisdom and scholarship in general was greatly increased. Moreover, Abbasid society itself came to understand and appreciate the value of knowledge, and support also came from merchants and the military.8 It was easy for scholars and translators to make a living and an academic life was a symbol of status.4 Wisdom was so valuable that books and ancient texts were sometimes preferred as war booty instead of other riches.4 Indeed, Ptolemy's Almagest was claimed as a condition for peace after a war between the Abbasids and the Byzantine Empire.11

The House of Wisdom was much more than an academic center removed from the broader society. Its experts served several functions in Baghdad. Scholars from the Bayt al-Hikma usually doubled as engineers and architects in major construction projects. They kept accurate official calendars and were public servants. They were also frequently medics and consultants.48

Al-Ma'mun was personally involved in the daily life of the House of Wisdom, regularly visiting its scholars and inquiring about their activities. He would also participate in and arbitrate academic debates.8 Furthermore, he would often organize groups of sages from the Bayt al-Hikma into major research projects to satisfy his own intellectual needs. For example, he commissioned the mapping of the world, the confirmation of data from the Almagest and the deduction of the real size of the Earth (see section on the main activities of the House). He also promoted Egyptology and participated himself in excavations of the pyramids of Giza.4

Al Ma'mun sends an envoy to the Byzantine Emperor Theophilos

Following his predecessors, al-Ma'mun would send expeditions of scholars from the House of Wisdom to collect texts from foreign lands. In fact, one of the directors of the House was sent to Constantinople with this purpose. During this time, Sahl ibn Harun, a Persian poet and astrologer, was the chief librarian of the Bayt al-Hikma. Hunayn ibn Ishaq (809–873) an Assyrian Nestorian Christian physician and scientist, was the most productive translator producing 116 works for the Arabs. As "Sheikh of the translators" he was placed in charge of the translation work by the caliph. The Sabian Thābit ibn Qurra (826–901) also translated great works by Apollonius, Archimedes, Euclid and Ptolemy. Translations of this era were superior to earlier ones, since the new Abbasid scientific tradition required better and better translations, and the emphasis was many times put in incorporating new ideas to the ancient works being translated.8

By the second half of the ninth century al-Ma'mum's Bayt al-Hikma was the greatest repository of books in the world and had become one of the greatest hubs of intellectual activity in the Middle Ages, attracting the most brilliant Arab and Persian minds.4 The House of Wisdom eventually acquired a reputation as a center of learning, although universities as we know them did not yet exist at this time — knowledge was transmitted directly from teacher to student, without any institutional surrounding. Maktabs soon began to develop in the city from the 9th century on, and in the 11th century, Nizam al-Mulk founded the Al-Nizamiyya of Baghdad, one of the first institutions of higher education in Iraq.

Decline and destruction by the Mongols

The House of Wisdom flourished under al-Ma'mun's successors al-Mu'tasim (r. 833–842) and his son al-Wathiq (r. 842 – 847), but considerably declined under the reign of al-Mutawakkil (r. 847–861).12 Although al Ma'mun, al Mu'tasim, and al Wathiq followed the sect of Mu'tazili, which supported mind-broadness and scientific inquiry, al-Mutawakkil endorsed a more literal interpretation of the Qur'an and Hadith.12 The caliph was not interested in science and moved away from rationalism, seeing the spread of Greek philosophy as anti-Islamic.12

Along with all other libraries in Baghdad, the House of Wisdom was destroyed by the army of Hulagu during the Siege of Baghdad in 1258.13 Nasir al-Din al-Tusi rescued about 400,000 manuscripts which he took to Maragheh before the siege.14

Although the Mongol invasion is usually considered the sole cause of the sharp end of Arab science, by the second half of the 13th century Baghdad was far from being the only academic center in the Abbasid Empire, so the destruction of the House of Wisdom was not the sole cause of the decay of Arab scholarship.13

Main activities

The House of Wisdom included a society of scientists and academics, a translation department and a library that preserved the knowledge acquired by the Abbasids over the centuries.8 Furthermore, linked to it were also astronomical observatories and other major experimental endeavors.4 Indeed, the House of Wisdom was much more than a library, and a considerable amount of original scientific and philosophical work was produced by scholars and intellectuals related to it.4

13th-century Arabic translation of Materia Medica


Over a century and a half, primarily Persian and Christian scholars translated all scientific and philosophic Greek texts available to them.1516 The translation movement at the House of Wisdom was kick-started by the translation of Aristotle's Topics. By the time of al-Ma'mum, translators had moved on from looking only at Persian astrological texts and Greek works were already in their third translation.4 Authors translated include: Pythagoras, Plato, Aristotle, Hippocrates, Euclid, Plotinus, Galen, Sushruta, Charaka, Aryabhata and Brahmagupta.

Furthermore, new discoveries motivated revised translations that commented corrected or added to the work of ancient authors.8 In many cases names and terminology were changed; a prime example of this is the title of Ptolemy's Almagest, which is an Arabic modification of the original name of the work: Megale Syntaxis.8

Original contributions

A page from al-Khwarizmi's Kitab al-Jabr
Drawing of Self trimming lamp in Ahmad ibn Mūsā ibn Shākir's treatise on mechanical devices.
Al-Idrisi's map of the world (12th). Note South is on top.

Besides translating and commentating earlier works, scholars at the Bayt al-Hikma produced important original research. For example, famous mathematician al-Khwarizmi worked in al-Ma'mun's House of Wisdom and is famous for his contributions to the development of algebra.4 He is also known for his book Kitab al-Jabr in which he develops a number of algorithms.4 The application of the word "algebra" to mathematics and the etymology of the word "algorithm" can be traced back to al-Khwarizmi - the actual concept of an algorithm dates back before the time of Euclid. Besides that, this mathematician is responsible for the introduction of the Hindu decimal system to the Arab world, and through them to Europe. There were also important breakthroughs in cryptanalysis by Al-Kindi.4

Other than that, there were also many original contributions to astronomy and physics. Mohammad Musa might have been the first person in history to point to the universality of the laws of physics.4 Later on, in the 10th century, Ibn al-Haytham (Alhazen) would perform several physical experiments, mainly in optics -area in which his achievements are still celebrated today.17

Mohammad Musa and his brothers Ahmad and Hasan (collectively known as the "Banu Musa brothers") were also remarkable engineers. They are authors of the renowned Book of Ingenious Devices, which describes about one hundred devices and how to use them. Among these was "The Instrument that Plays by Itself", the earliest example of a programmable machine.18

In medicine, Hunayn wrote an important treatise on ophthalmology. Other scholars also wrote on smallpox, infections and surgery. Note that these works, would later become standard textbooks of medicine in the Renaissance.19

Under al-Mamun's lead science saw for the first time bigger research projects involving large groups of scholars.20 In order to check Ptolemy's observations, the caliph ordered the construction of the first astronomical observatory in Baghdad (see Observatories section below). The data provided by Ptolemy was meticulously checked and revised by a highly capable group of geographers, mathematicians and astronomers.8 Al-Mamun also organized research on the circumference of the Earth and commissioned a geographic project that would result in one of the most detailed world-maps of the time.20 Some consider these efforts the first examples of state funded research mega-projects.20


The creation of the first observatory in the Islamic world was ordered by caliph al-Mamun in 828. The construction was directed by scholars from the House of Wisdom: senior astronomer Yahya ibn abi Mansur and the younger Sanad ibn Ali al-AlYahudi.21 It was located in al-Shammasiyya and was called Maumtahan Observatory. After the first round of observations of Sun, Moon and the planets, a second observatory on Mount Qasioun, near Damascus, was constructed. The results of this endeavor were compiled in a work known as al-Zij al-Mumtahan, which translates as "The Verified Tables".2022


This is a list of notable people related to the House of Wisdom, most of them are mentioned in the text above. Besides the listed occupation, most of them were also translators:

Other houses of wisdom

Some other places have also been called House of Wisdom, and should not be confused with Baghdad's Bayt al-Hikma:

See also

Notes and citations

  1. ^ [1], Encyclopædia Britannica
  2. ^ Hyman and Walsh Philosophy in the Middle Ages Indianapolis, 1973, p. 204' Meri, Josef W. and Jere L. Bacharach, Editors, Medieval Islamic Civilization Vol.1, A - K, Index, 2006, p. 304.
  3. ^ Meri, p. 451.
  4. ^ a b c d e f g h i j k l m n o p q r Al-Khalili, pp. 67-78
  5. ^ Ferguson, Kitty Pythagoras: His Lives and the Legacy of a Rational Universe Walker Publishing Company, New York, 2008, (page number not available – occurs toward end of Chapter 13, “The Wrap-up of Antiquity”). “It was in the Near and Middle East and North Africa that the old traditions of teaching and learning continued, and where Christian scholars were carefully preserving ancient texts and knowledge of the ancient Greek language.”
  6. ^ Kaser, Karl The Balkans and the Near East: Introduction to a Shared History p. 135.
  7. ^ Yazberdiyev, Dr. Almaz Libraries of Ancient Merv Dr. Yazberdiyev is Director of the Library of the Academy of Sciences of Turkmenistan, Ashgabat.
  8. ^ a b c d e f g h i j k l Lyons, pp. 55-77
  9. ^ Meri, Josef W. and Jere L. Bacharach. “Medieval Islamic Civilization”. Vol. 1 Index A – K. 2006, p. 304.
  10. ^ Wiet. Baghdad
  11. ^ Angelo, Joseph (2009). Encyclopedia of Space and Astronomy. p. 78. ISBN 9781438110189. 
  12. ^ a b c Al-Khalili, p. 135
  13. ^ a b Al-Khalili, p. 233
  14. ^ Saliba, p.243
  15. ^ Rosenthal, Franz The Classical Heritage in Islam The University of California Press, Berkely and Los Angeles, 1975, p. 6
  16. ^ Adamson, London Peter The Great Medieval Thinkers: Al-Kindi Oxford University Press, New York, 2007, p. 6. London Peter Adamson is a Lecturer in Late Ancient Philosophy at King's College.
  17. ^ Al-Khalili, pp. 152-171
  18. ^ Koetsier
  19. ^ Moore
  20. ^ a b c d Al-Khalili, pp. 79-92
  21. ^ Hockey 1249
  22. ^ Zaimeche, p. 2


  • Koetsier, Teun (2001), "On the prehistory of programmable machines: musical automata, looms, calculators", Mechanism and Machine Theory (Elsevier) 36 (5): 589–603, doi:10.1016/S0094-114X(01)00005-2. 
  • Micheau, Francoise, "The Scientific Institutions in the Medieval Near East",   in (Morelon & Rashed 1996, pp. 985–1007)

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