Ah yes I think it was him, it's been a while since I listened to the podcast but I remember a pretty lengthy discussion about the Parthians, thank you for letting me know. On a side note though, if you're interested in history you should check out the Hardcore History podcasts, Dan Carlin is an American radio DJ who has been studying history for years, it's a great podcast to pass the time, especially since a whole series can come to about 15 hours. They are available for free on iTunes, I would definitely recommend them.