Madoc: An Essay On The Discovery Of America By Madoc Ap Owen Gwynedd In The Twelfth Century is a historical book written by Thomas Stephens. The book explores the theory that Madoc, a Welsh prince, discovered America in the 12th century, several centuries before Christopher Columbus. The author examines the evidence and the accounts of the Welsh voyages to America, including the stories of the Mandan tribe in North Dakota, who spoke Welsh and claimed...