Any picture of Cynicism must be a synthesis of widely different types of material and of thousands of different items, each of which should, ideally, have been subject to exact scrutiny. The synthesis must also allow for the possibility of difference between different Cynics and different periods of Cynicism. In the reconstruction of Diogenes' life and activity, the general distortions in the ancient traditions about Cynicism are exacerbated by the fact that Diogenes was himself a flamboyant self-dramatist, who provoked extremes of admiration, hostility and imaginative invention, thus inspiring a rich and varied Diogenes-legend. The main outlines of Diogenes' activities in Athens and Corinth are clear. This chapter discusses the evidence regarding Diogenes' celebrated 'cosmopolitanism'. Numerous ancient sources link Diogenes with 'cosmopolitan' sentiment. The false attribution of that sentiment to Socrates is naturally explained as retrojection of Diogenic material upon the 'father' of the whole Cynic-Stoic 'succession'.