 With the exception of poetry allegedly written while on Alexander’s expedition (which, as far as we can tell, did not survive that expedition), Pyrrho wrote nothing; we are therefore obliged to try to reconstruct his philosophy from reports by others. Unfortunately the reports that we have are fragmentary and, in many cases, of doubtful reliability. Pyrrho’s follower Timon wrote numerous poems and prose works; but of these only fragments and in some cases second-hand reports survive. It is likely that much of what we hear about Pyrrho in later sources also derives indirectly from Timon, but it is frequently not possible to judge, in individual cases, whether or not this is so. Other difficulties concerning Timon’s evidence are, first, that he writes as a devotee rather than as a neutral reporter, and second, that the great majority of Timon’s fragments derive from a poem called Silloi (Lampoons), and consist of satirical thumbnail sketches of other philosophers rather than any kind of direct exposition of Pyrrho’s outlook. (See the entry on Timon, section 2, for details.) Nevertheless, Timon is clearly the most important and the most trustworthy source of information about Pyrrho. Of the evidence from Timon, one piece looks to be especially important. This is a summary, by the Peripatetic Aristocles of Messene (late 1st c. BCE), of an account by Timon of what appear to be Pyrrho’s most general philosophical attitudes. It is widely agreed that this passage must be the centerpiece of any interpretation of Pyrrho’s philosophy. However, its usefulness for this purpose depends in part on how much of it is actually talking about Pyrrho’s attitudes, as opposed to Timon’s own developments or expansions of them. As we shall see, this is one of many difficulties in interpreting the passage.