Beer is the most widely consumed alcoholic beverage in the world and is the third most consumed beverage overall (behind water and tea). Beer is one of the oldest beverages on earth, dating back to 5000 BC. Reinheitsgebot, the German beer purity law, was adopted in 1516 - stating that beer should only contain water, barley, hops, and yeast. US President George Washington had his own brewhouse on the grounds of Mount Vernon. Germans started using hops in beer in the late 1200s - essentially the star of modern brewing. Early beers were brewed almost entirely by women. The first beer "advertisement" is beleieved to be from 4000 BC with an image of a woman holding goblets of beer in each hand carved into a stone tablet.