For some odd reason, over the course of last couple of years, I keep 'bumping' into crisis of third century and 'dark ages' that followed. And with every 'bump' I find it quite fascinating how different historians can analyze same events, sources, processes and come to quite different conclusions.
Professor Noble uses his 36 lectures for a walkthrough of crisis of third century and its consequences on Roman Empire all the way to the end of 8th century, at which time (at least according to the good professor) the transformation of Byzantine Empire into its 'Greek' form was complete. Breath and scope of material covered by those lectures as well as the amount of information in each of them is quite impressive. Mandatory chronological narrative is complemented by thorough analysis of politics, economy and culture in Rome/Bysantium as well as in areas taken over by 'Barbarians'. Special attention is given to turbulent history of early Christianity and its journey from irrelevance and obscurity to dominant role as universal religion of Romans and barbarians alike. The overview of the period is made complete with couple of lectures dedicated to Islam and impact of the rise of Islamic Caliphate on already existing powers in the region.
As a learning experience, this set of lectures is definitely one of the best I've gone through so far. It provides a deep and multi-faceted picture of the era. I would recommend it without reservation as an introduction to subject matter. What's even more important, the good professor has a knack for telling a good story, so those lectures are actually also fun to listen to.
I would however raise a warning finger regarding professor's overall conclusions about that era and the topic of 'fall of Roman Empire' in particular. True, Gibbon's apocalyptic description of 'dark ages' is most probably a hyperbole, most modern scholars seem to agree on that point. But claiming that the 'Fall' was really just a seamless transformation into something slightly different, but the same nevertheless... that's going a bit too far IMHO. For contrast and comparison, I would warmly recommend Peter Heather's "Empires and Barbarians".