A miracle attributed to Saint Brigid was the conversion of bathwater into this substance.
A miracle attributed to Saint Brigid was the conversion of bathwater into this substance. Wilhelm IV enacted the first regulation on this substance, a Reinheitsgebot. Hildegard von Bingen described its production, and Tacitus criticized this substance's use by Germanic tribes. A hall for this substance was the site of a namesake putsch by the SA that was intended to replicate the March on Rome; that attempted coup led to the creation of the Nazi blood flag. For 10 points, identify this substance flavored with hops and brewed with malted barley, a mild alcoholic beverage.
A miracle attributed to Saint Brigid was the conversion of bathwater into this substance.
{beer} [prompt on equivalents]