In our first discussion on Plato's letters, we look at his best-known Seventh Letter. In the letter, Plato relates his experience with Dionysius, the tyrannical ruler of Syracuse, and the philosophically minded Dion was was persecuted by Dionysius. Plato's extraordinary recounting of his time teaching both Dionysius and Dion demonstrates his success with the latter, and failure with the former. There are many intriguing parallels between the situation in Syracuse 2,400 years ago, when Plato wrote, and the political and social environment in which we find ourselves today. Plato's account highlights the ills that befall a society whose rulers don't practise philosophy, and we see such rulers now, in the 21st century. The philosophical principles and observations about human nature that Plato expressed over two millennia ago remain relevant today, and in our next episode on the Seventh Letter we'll explore the age-old question "Can virtue be taught?"