980 – 1037
Avicenna (Ibn Sina, c. 980–1037) was a Persian polymath and one of the most influential philosophers of the Islamic Golden Age. His synthesis of Aristotelian philosophy with Neoplatonic and Islamic thought shaped both medieval Islamic philosophy and later Scholasticism, and his work in metaphysics, logic, and medicine remained authoritative for centuries.
Authored The Book of Healing (Kitab al-Shifa), a comprehensive philosophical encyclopedia
Wrote The Canon of Medicine, the standard medical text in Europe and the Islamic world for centuries
Formulated the 'Floating Man' thought experiment arguing for the soul's self-awareness independent of the body
Developed the distinction between essence and existence, foundational to later metaphysics
Advanced the modal cosmological argument based on the Necessary Existent (wajib al-wujud)