E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
The youngest son of Owain Gwyneth, King of North Wales, who died in 1169. According to tradition he sailed away to America, and established a colony on the southern branches of the Missouri. About the same time the Aztecas forsook Aztlan, under the guidance of Yuhidthiton, and founded the empire called Mexico, in honour of Mexitli, their tutelary god. Southey has a poem in two parts called Madoc, in which these two events are made to harmonise with each other.