When was the first beer ever brewed? As far as we know, when did humans first brew beer, and where? Around when would you have been able to get your hands on something resembling a modern lager?
As Slyboty notes correctly, beer is a very ancient drink predating the oldest written records (and likely any archeological discoveries.) For millennia though beer was made only from fermented malt with various add-ons.

The major change that gave origin to modern beers though is the addition of hops, for the first time creating a beer closely resembling modern lagers. The first documented use of hops in beer is dated 822 A.D. [source] although records of hops cultivation dates back to 736 [source] which suggests use of hops in brewing predates written records by a considerable margin.