What I meant was beer that was brewed 1500 years ago, not brewed in the 1500's.
In other words, a beer brewed in the year 506 would not look or taste like any beer we have today. First off, all beer was dark prior to 1842. Second, I believe the first mention of using hops in beer was somewhere in the 700s. Up until then brewers, or should I say "brewsters" (the female brewers - wives) used all sorts of forest plants in their brews, mostly herbs I'd say. I would venture a guess that beer probably tasted a lot like Jagermeister or Underberg. These are made from things that grow in the forests.
As far as recipes are concerned, the first "German" beer recipe was found in Kulmbach in about 800 BC, (Germany) geographically speaking since I don't think the Teutons/Alamani were organizing in that area.