In this episode of Talking History - the story of Caracalla and Geta, the two emperors who share power in the new Gladiator 2 film, how their father Severus transformed Rome, and how their dynasty ended in violence and murder. Patrick Geoghegan is joined by Dr David Woods, Head of the Department of Classics at UCC; Prof Mark Humphries, Professor of Ancient History, Swansea University; and Dr Rebecca Usherwood, Assistant Professor in Late Antique and Early Byzantine Studies at Trinity College Dublin.