Andrew Brown 
A New Companion to Greek Tragedy (Routledge Revivals) [PDF ebook] 

That the works of the ancient tragedians still have an immediate and profound appeal surely needs no demonstration, yet the modern reader continually stumbles across concepts which are difficult to interpret or relate to – moral pollution, the authority of oracles, classical ideas of geography – as well as the names of unfamiliar legendary and mythological figures.

A New Companion to Greek Tragedy provides a useful reference tool for the ‘Greekless’ reader: arranged on a strictly encyclopaedic pattern, with headings for all proper names occurring in the twelve most frequently read tragedies, it contains brief but adequately detailed essays on moral, religious and philosophical terms, as well as mythical genealogies where important. There are in addition entries on Greek theatre, technical terms and on other writers from Aristotle to Freud, whilst the essay by P. E. Easterling traces some connections between the ideas found in the tragedians and earlier Greek thought.