Ibn Badis, Author of the Staff of the Scribes

Al- Muʻizz ibn Bādīs (Arabic:  المعز بن باديس‎); 1008–1062) was the fourth ruler of the Zirids in Ifriqiya, reigning from 1016 to 1062.

Al-Muizz ascended the throne as a minor following the death of his father Badis ibn Mansur,  with his aunt acting as regent. In 1016 there was a bloody revolt in Ifriqiya in which the Fatimid residence Al-Mansuriya was completely destroyed and 20,000 Shiites were massacred. The unrest forced a ceasefire in the conflict with the Hammadids of Algeria, and their independence was finally recognized in 1018.

Al-Muizz took over the government in 1022 following the overthrow of his aunt. The relationship with the Fatimids was strained, when in 1027 they supported a revolt of the Zanatas in Tripolitania which resulted in permanent loss of control of the region. His son Abdallah shortly ruled Sicily in 1038-1040, after intervening with a Zirid army in the civil war that broke out in the island.

The political turmoil notwithstanding, the general economic well-being initially made possible an extensive building program. However, the kingdom found itself in economic crisis in the 1040s, reflected in currency devaluation, epidemic and famine. This may have been related to the high level of tribute which the Zirids were compelled to pay annually to the Fatimids (one million gold dinars a year).

When al-Muizz (under the influence of Sunni jurists in Kairouan, growing Sunni public pressure in his realm and a violent backlash against the Shi'ite minority) recognized the Abbasids in Baghdad as rightful Caliphs in 1045 and adopted Sunni orthodoxy, the break with the Fatimids was complete. He even denounced the Fatimids and their followers as heretics in newly minted coinage.

The Fatimids then deported the Bedouin tribes of the Banu Hilal and the Banu Sulaym fromEgypt to Ifriqiya. The invasion of the Bedouin (1051–1052) led to great hardship after the defeat at Jabal Haydaran, severely impacting agriculture in Ifriqiya. The conquest of Kairouan in 1057 resulted in further anarchy. The Zirids lost control over the hinterland and were only able to retain the coastal areas, the capital being moved to Mahdia. With the growth of Bedouin Emirates and the continuing insecurity inland, the economy of Ifriqiya looked increasingly towards the Mediterranean, with the result the coastal cities grew in importance through maritime trade and piracy.

Al-Muizz was succeeded by his son Tamim ibn Muizz. 

Al-Muizz ibn Badis is usually thought to be the author of the famous Kitab `umdat al-kuttab wa `uddat dhawi al-albab (Staff of the Scribes). It is divided in twelve chapters.  Al-Muizz wrote on (amongst others) on the excellence of the pen, on the preparation of types of inks, the preparation of colored inks, metallic inks (including ones prepared from silver filings and alcohol), the coloring of dyes and mixtures, secret writing, the making of paper and the Arabic gum and glue. 

The expansion of paper manufacturing kick started other professions, like those of dyers, ink makers, manuscript craftsmen and calligraphers.  The sciences also benefited.  The pioneering Tunisian, Ibn Badis, described this in his Staff of the Scribes.

Ibn al-Wafid, Author of The Book of Simple Drugs

Ibn al-Wafid

Ibn al-Wafid (Ali Ibn al-Husain Ibn al-Wafid) (997-c.1074), known in Latin Europe as Abenguefit, was a pharmacologist and physician from Toledo. He was the vizier of  Al-Mamun of Toledo. His main work is Kitāb al-adwiya al-mufrada (The Book of Simple Drugs) (كتاب الأدوية المفردة, translated into Latin as De medicamentis simplicibus).

Ibn al-Wafid was mainly a pharmacist in Toledo, and he used the techniques and methods available in alchemy to extract at least 520 different kinds of medicines from various plants and herbs.

Ibn al-Wafid's student Ali Ibn al-Lukuh was the author of ʿUmdat al-Ṭabīb fī Maʿrifat al-Nabāt li kulli Labīb, a famous botanical dictionary.

Kitāb al-adwiya al-mufrada (The Book of Simple Drugs) ran to five hundred pages, taking twenty-five years to compile.  The Latin translation, De medicamentis simplicibus is only a fragment of all his work.  

As well as investigatin the action of drugs, sleep and bathing, Ibn al-Wafid also wrote on farming, because agriculture, plant cultivation, botany, chemistry and medicine were closely linked.

Ibn al-Thahabi, Author of First Known Alphabetical Medical Encyclopedia

Ibn al-Thahabi
Ibn al-Thahabi (Abu Mohammed Abdellah Ibn Mohammed Al-Azdi) (Arabic: ابو محمد عبدالله بن محمد الأزدي‎) (ca. ? - 1033, in Valencia, Al-Andalus [Islamic Spain]), known also as Ibn Al-Thahabi, was an Arab physician, famous for writing the first known alphabetical encyclopedia of medicine.

Ibn al-Thahabi was born in Suhar, Oman.  He moved then into Basra,  then to Persia where he studied under Al-Biruni and Ibn Sina.  Later he migrated to Jerusalem and finally settled in Valencia, in Al-Andalus (Islamic Spain).

Ibn al-Thahabi is famous for his book Kitab al-Ma'a (The Book of Water), which is a 900 page medical encyclopedia that lists the names of diseases, its medicine and a physiological process or a treatment. It is the first known alphabetical classification of medical terms. In this encyclopedia, Ibn Al-Thahabi not only lists the names but adds numerous original ideas about the function of the human organs. It also contains a course for the treatment psychological symptoms. The main thesis of his medication is that cure must start from controlled food and exercise and if it persists then use specific individual medicines.  If it still persists, then use medical compounds. If the disease continued, surgery was performed.

Ibn al-Shatir, The "Father" of Copernicus' Theory

Ala Al-Din Abu'l-Hasan Ali Ibn Ibrahim Ibn al-Shatir (1304 – 1375) (Arabic: ابن الشاطر‎) was an Arab Muslim astronomer, mathematician, engineer and inventor who worked as muwaqqit (موقت, religious timekeeper) at the Umayyad Mosque in Damascus, Syria.

Ibn al-Shatir conducted extensive observations which led to some of his theoretical contributions, designed and constructed new instruments, and made advanced contributions to Islamic astronomy in the field of planetary theory.

His most important astronomical treatise was the Kitāb Nihāyat al-Suʾāl fī Taṣḥīḥ al-ʾUṣūl (كتاب نهاية السؤال في تصحيح الأصول - The Final Quest Concerning the Rectification of Principles), in which he drastically reformed the Ptolemaic models of the Sun, Moon, and planets. While previous Maragha school models were just as accurate as the Ptolemaic model, Ibn al-Shatir's geometrical model was the first that was actually superior to the Ptolemaic model in terms of its better agreement with both contemporary theory and empirical observations. 

Experimentally Ibn al-Shatir employed careful eclipse observations to measure the apparent size of the Sun and Moon and found that they disagreed with Ptolemaic expectations. His work on his experiments and observations (e.g. Ta'liq al-arsad, or Accounting for Observations) has not survived, but there are references to it in his Final Quest Concerning the Rectification of Principles.

Theoretically, Ibn al-Shatir objected to Aristotle's ether, in its eternal uniformity, and argued that if one grants that the heavens must allow for a variation in composition then there's no reason to reject epicycles, while agreeing that equants and eccentrics, which violated Aristotelian principles of uniform circular motion and gravity, were impossible. He then built a model that by adding new epicycles utilizing the Tusi-couple eliminated entirely the epicycle in the solar model, the eccentrics and equants in the planetary models, and the eccentric, epicycles and equant in the lunar model. The resulting model was one in which the Earth was at the exact center of the universe around which all heavenly bodies moved in uniform circular motions, remained as accurate as Ptolemy in predicting the paths of heavenly bodies, and improved on Ptolemy by accurately predicting the apparent size and distance of the Sun and Moon.

By creating the first model of the cosmos in which physical theory, mathematical model, and empirical observation were in agreement, Ibn al-Shatir marked a turning point in astronomy which may be considered a "Scientific Revolution before the Renaissance".

Although his system was firmly geocentric — he had eliminated the Ptolemaic equant and eccentrics  — the mathematical details of his system encompassed those in Nicolaus Copernicus' De revolutionibus, which had retained the Ptolemaic eccentric.  Copernicus' lunar model was identical to the lunar model of al-Shatir.  It is noted that in Copernicus' Commentariolus his model of Mercury is mistaken, and that snce it is Ibn al-Shatir's model, this is further evidence, and perhaps the best evidence, that Copernicus was in fact copying without full understanding from some other source. All this suggests that Ibn al-Shatir's model may have influenced, if indirectly, Copernicus while constructing the latter's heliocentric model. How Copernicus would have come across al-Shatir's work, exactly, remains an open question, but there are some number of possible routes for first or secondhand transmission.

Ibn al-Shatir constructed a magnificent sundial for the minaret of the Umayyad Mosque in Damascus which gave both seasonal and equinoctial hours. The fragments of this sundial in a Damascus museum make this the oldest polar-axis sundial still in existence.

Ibn al-Shatir made a timekeeping device incorporating both a universal sundial and a magnetic compass. 

The compendium, a multi-purpose astronomical instrument, was first constructed by Ibn al-Shatir. His compendium featured an alhidade and polar sundial among other things. These compendia later became popular in Renaissance Europe.

Ibn al-Shatir described another astronomical instrument which he called the "universal instrument" in his Rays of light on operations with the universal instrument (al-ʾashiʿʿa al-lāmiʿa fī al-ʿamal bi-l-āla al-jāmiʿa). A commentary on this work entitled Book of Ripe Fruits from Clusters of Universal Instrument (Kitāb al-thimār al-yāni'a ʿan qutāf al-āla al-jāmiʿa) was later written by the Ottoman astronomer and engineer Taqi al-Din, who employed the instrument at the Istanbul observatory of Taqi al-Din from 1577-1580.

In the case of lunar motion, Ibn al-Shatir corrected Ptolemy, whose imagined Moon approached far closer to the Earth than did the actual Moon.

Many believe that astronomy died with the Greeks, and was brought back to life again by Copernicus, the 15th century Polish astronomer who is famous for introducing the Sun-centered (heliocentric) theory of the solar system, which marked the beginning of modern astronomy.

However, many historians now think it is not a coincidence that his models of planetary theory are mathematically identical to those prepared by Ibn al-Shatir over a century before him.  It is known that Copernicus relied heavily on the comprehensive astronomical treatise by al-Battani, which included star catalogues and planetary tables.

The mathematical devices discovered by Muslims before Copernicus, referred to in modern terms as linkages of constant length vectors rotating at constant angular velocities, are exactly the same as those used by Copernicus.  The only, but important, differences between the two was that the Muslims' Earth was fixed in space, whereas Copernicus had it orbiting around the Sun.  Copernicus also used instruments which were particular to astronomy in the East, like the parallactic ruler, which had previously only been used in Samarkand and Maragha Observatories.

Ibn al-Saffar, Andalusian Astronomer

Ibn al-Saffar

Abu al‐Qasim Ahmad ibn Abd Allah ibn Umar al‐Ghafiqī ibn al-Saffar al‐Andalusi (b. Cordoba - d. 1035 at Denia), Ibn al-Saffar (literally: son of the brass worker) was a close colleague and astronomer at the school founded by al-Majriti in Cordoba.  His most well known work was a treatise on the astrolabe.  The work was still published until the 15th century and influenced the work of Kepler.  Ibn Saffar also wrote a commentary on the Zij al-Sindhind,  and measured the coordinates to Mecca.