 Two of his works in particular, "El-Mansuri" and "Al-Hawi", provide descriptions and treatments for mental illnesses.Abu-Ali al-Husayn ibn Abdalah ibn-Sina (980-1030), known to the west as Avicenna, was a Persian polymath who is widely regarded for his writings on such diverse subjects as philosophy, physics, medicine, mathematics, geology, Islamic theology, and poetry.In his most widely celebrated work, the Canon of Medicine (Al-Qanun-fi-il-Tabb), he provided descriptions and treatments for such conditions as insomnia, mania, vertigo, paralysis, stroke, epilepsy, and depression as well as male sexual dysfunction.