Scholars have been seeking to understand Sophocles' Electra for over two millennia. The beginnings of this long tradition of the play's interpretation lie in Hellenistic Alexandria and are now beingrepresented by a series of notes which have survived in the margins of medieval manuscripts. The book offers an English introduction and an authoritative new critical text of these notes based on a thorough review of the manuscript evidence and the best modern scholarship. The critical text is accompanied by an apparatus criticus and is placed in its scholarly context by means of a rich collection of parallel passages.