It is indeed from Scotland and Belhaven has been brewing ales, beers and stout in Scotland. for about two centuries. Their brewery is located in Dunbar, East Lothian in Scotland.
Another excellant ale they brew is St. Andrew's Ale. They brew several other products that are not exported but are only available in the UK.
Here is the url for their website:
http://www.belhaven.co.uk/row/index.php
Etiam non princeps sed usque ad genua, Principis Pacis!