Very little is known about the history of the town before the Villa was founded. Some historians have toyed with the idea that Bilbao was once Roman Flaviobriga, on the basis that Roman coins have been found in the estuary, although this teory has not been proved conclusively. What has been proved is that we Bilbainos had contact with the Normans, true masters of the Atlantic link back then in the 9th Century. Perhaps it was they who taught use the arts of sailing and commerce.