I recently listened to Purcell's "King Arthur", and at one point in the libretto, the Saxons sing of the "juice that makes the Britons bold" (at 11:40 in the linked video; the movement starts at 11:00), which immediately made me think of Asterix with the magic potion(/juice) that makes the Gauls(/Celts/Britons) strong(/bold).
Is there some underlying mythology about some Celtic potion that makes people bold/strong, or is the connection entirely apparent and spurious? (And in the case of the latter, what does the juice actually refer to?)
As an aside, I also find it interesting that they'd drink British potions in the hall of Woden. What's up with that?
The whole libretto is available here.
(Yes, this is very similar to my other question. King Arthur deals me a few surprises.)