This volume focuses on Ibn Sina - the Avicenna of the Latin West - and the enormous impact of his philosophy in both the Islamic and Christian worlds. Jules Janssens opens with a new introductory article, surveying the position of work in the field. The next studies look at Ibn Sina's work and thought, inspired by Alexandrian Neoplatonism on the one hand, and the Qur'an on the other, notably his views on the relationship between God and the world, within the context of Islam. There follow explorations of Ibn Sina's influence on later philosophers, first within the Islamic world and with particular reference to al-Ghazzali, but also, once translated into Latin, in the scholastic world of the West, on figures such as Albert the Great, Thomas Aquinas, and above all Henry of Ghent.