In Welsh folklore, Madoc ab Owain Gwynedd was a Welsh prince who sailed to the Americas in 1170, over 300 years before Christopher Columbus's voyage in 1492. According to the story, Madoc was a son of
Madog. Book illustration by A.S. Boyd, 1909.
George Catlin thought the Mandan bull boat to be similar to the Welsh coracle.
Plaque at Fort Morgan showing where the Daughters of the American Revolution supposed Madoc had landed in 1170.
Madoc's proponents believe earthen fort mounds at Devil's Backbone along the Ohio River to be the work of Welsh colonists.