hurstwic.org/history/articles/manufacturing/text/viking_shields.htm
*Drops that on the table*
As for the Norman shields - they did indeed have a few round shields. Not as wide as Viking shields, but still round. They also used flat-topped kite shields alongside the tear-drop shaped kite shields.
Ex:en.wikipedia.org/wiki/File:Geoffrey_of_Anjou_Monument.jpg
(I would format everything, but "Sorry, you are not allowed to post external links until you have been on this forum longer." Popped up.)