The Answer..No. They used references from a rare 12th century manuscript, the Libellus Plumbeus which clearly shows a floating "island" and gives a full and indepth description of thier uses and users.
I have been given access to this document and have been able to recreate one of the scenes shown as shown below.
| Here we see a farmer, who after helping to secure the anchor rope is asking wether his ploughing is straight. Life was much more simple back then eh?? |



