Cynicism is a philosophical tradition that existed for centuries in the ancient Graeco-Roman world. Its influence can be found in the Christian gospels, throughout the Western philosophical tradition, and arguably up to the present day in the work of such protest groups as Just Stop Oil and Extinction Rebellion - not bad for a philosophical school whose most famous early practitioner lived in a wine jar and masturbated in public. But what exactly did the Cynics believe? and what can we learn from them today?