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Owain ap Dyfnwal (fl. 934) was an early tenth-century King of Strathclyde. He was probably a son of Dyfnwal, King of Strathclyde, who may have been related to previous rulers of the Kingdom of Strathclyde. Originally centred in the valley of the River Clyde, this realm appears to have undergone considerable southward expansion in the ninth or tenth century, after which it increasing came to be known as the Kingdom of Cumbria.