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Who was Ibn Sina, and why does he matter?

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Ibn Sina (c. 980–1037), known in the Latin West as Avicenna, was a Persian polymath whose medical encyclopaedia was a standard European university textbook for six centuries — an influence few works of any kind have matched.

His background. Born near Bukhara in present-day Uzbekistan, he was an extraordinary prodigy: by his own account he had memorised the Quran by ten and mastered the available medical texts by sixteen, treating patients thereafter. He gained access to the Samanid royal library after treating the ruler, which he credited as decisive.

He spent much of his life moving between courts amid political instability, serving as physician and administrator, writing prolifically — frequently at night and, by his account, while travelling.

The Canon of Medicine (al-Qanun fi al-Tibb). A systematic encyclopaedia organising the whole of medical knowledge — Greek, Persian, Indian and Arabic — into one structured work.

Why it dominated for so long. Its organisation. Earlier medical writing was scattered; the Canon arranged principles, materia medica, specific diseases by body region, compound remedies and general conditions into a coherent system that could be taught and consulted. It was translated into Latin in the twelfth century and remained in use in European universities into the seventeenth.

What it contained that was genuinely advanced: recognition of contagious disease and the suggestion of quarantine; description of the contamination of water and soil in spreading disease; systematic clinical observation and case recording; discussion of the requirements for testing a drug, including that it be tested on a single condition and that results be reproducible; and extensive pharmacology.

The Book of Healing is his philosophical encyclopaedia, covering logic, natural sciences, mathematics and metaphysics.

His philosophical influence was substantial in both Islamic and Christian thought — his arguments concerning necessary and contingent existence were engaged with by Aquinas and others, and the flying man thought experiment, imagining a person suspended without sensory input to argue for self-awareness independent of the body, anticipates later discussions of consciousness.

He was also criticised by later Islamic thinkers, notably al-Ghazali, and the debate that followed is significant in its own right.

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