This volume analyses ancient and medieval theories of intentionality in various contexts: perception, imagination, and intellectual thinking. It sheds new light on classical theories (e.g. by Aristotle and Thomas Aquinas) and examines neglected sources, both Greek and Latin. It includes contributions by J. Biard, M. Burnyeat, V. Caston, D. Frede, R. Gaskin, E. Karger, C. Michon, D. O'Meara, C. Panaccio, R. Pasnau, D. Perler, Ch. Rapp, P. Simons, R. Sorabji, and H. Weidemann.