A fortnightly military history podcast looking at all aspect of war throughout the ages.
http://www.thehistorynetwork.org
Swords around the throne: bodyguards of kings and emperors
Jasper, Lindsay, Murray and Mike discuss the use of bodyguards from Alexanders men having to prevent him from getting into harm through to being a symbol of power in Rome, and of course a long look at the Pretorian guard.