It's the leadMy grandmothers back garden was excavated in the 1930s, it was in the site of a Roman villa. No one knows why there was a villa there. There is a roman camp a few miles from where she later lived, it is actually two camps and was a great place to play for an 8 yr old, no one knows why it was there. There are many Roman roads in N Yorkshire which go from nowhere to nowhere, even when you know the destination frequently you dont know why it was a destination. My conclusion is that the Romans liked mead too much for their own good.