On the death of Colonel Thomas Francis Wade in 1847,[2] he was made an assistant poor-law commissioner, but found the duties too heavy.
When the government decided in 1822 to publish an edition of the old British historians, the Welsh portion of the work was entrusted to John Humffreys Parry.
His work falls mainly under two heads – the publication of the ancient Welsh laws, and the accumulation of material for an edition of the Brut y Tywysogion (Chronicle of the Princes).
The short portion which ends at 1066 was edited by him for the Monumenta Historica Britannica (1848), but the bulk of his material remained unpublished, and went to the Public Record Office on his death in 1851.
When in 1860 the Rolls Series edition of Brut y Tywysogion appeared, under the editorship of John Williams (Ab Ithel), the reviewer in Archaeologia Cambrensis asserted that the text and the translation were the work of Owen, who was not mentioned in the book.