1656 To 1662
In April 1656, Dubhaltach acted as a witness to his hereditary lord, Dathi Og O Dubhda (David O Dowd) upon his marriage to Dorothy O Down. He may have drafted the "Articles of Agreement" or marriage articles, in English. Two other Mac Fhirbihisgh's, his brother Seamus and cousin Myles, are also listed as witnesses. In the same year he compiled a work on legendary Irish authors. It is now lost apart from a partial copy begun in May 1657. The final part of it, comprising about a third of the total, was only completed in the spring of 1666.
In October 1657 - on a Sunday - Dubhaltach was writing in Sligo town, beside the ruined Dominican Abbey. His presence there was in direct contravention of a Cromwellian edict that forbade Catholics to approach or enter towns such as Sligo. Added to that, his working on a Sunday would have further aroused Puritan ire. His labour was adding further material to Leabhar na nGenealach from manuscripts no longer extant. The tracts included Séanadh Saighre and Do Fhorshloinntibh Éireann. After this he disappears until around 1662 when it is named in an official report as liable to pay hearth-tax for a dwelling in Castletown, just a few miles north of his native Lackan. Also around this time, he is mentioned in print for the only time in his life, in Cambrensis Eversus, by John Lynch.
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