This volume brings together researchers to analyse and describe the concept of happiness in its various appearances in the history of thought. They trace its journey from the very first writings in Greek literature and historiography, through early Greek philosophy, Classical, Hellenistic and Neoplatonic philosophers, 10th century Christian manuscript writings, early and late medieval mysticism to the medieval Hindu philosophy of liberation, early modern philosophy and contemporary positive psychology. As the volume shows, happiness appears in many forms, all connected with the human sense of approaching oneness with the world or with the divine.