This site has great articles, but is plagued by ads, so I use the Firefox reading mode to read it.
Discussion
This one focuses on where Garibald I. lived, around Regensburg.
And this one helped me remember that the Langobarden were to the east of Bavaria. I keep mixing them up with the Burgund.
The book takes place during the collapse of the Ostrogoths and the expansion of the Franken and Byzantine, which is an era I'm very unfamiliar with.