Dating back at least 5000 years, beer can readily be made with any of a variety of cereals. Thus, it's no wonder that beer is the ancient of ales. As wild yeasts entered foods they would ferment thus producing beer. It would have been difficult to prevent this fermentation so people of ancient times would drink their liquids anyway. Over the course of time they discovered an added benefit to their new found drink, intoxication. Although ancient Egyptians are credited for much of it, nearly every society had their own form of the brew.