Roger Gilla Dubh Ó Seachnasaigh

Ó Seachnasaigh was married to Elis Lynch at the time of his father's death, by whom he had his heir, Sir Dermot, and a daughter, Gyles.

[1] Gyles Ni Seachnasaigh, who receives no mention in the surviving O'Shaughnessy pedigrees, but who appears in several other sources, married Donal III O'Donovan of County Cork.

She had sons Donal IV O'Donovan, Cornelius, Morogh and Richard, and is an ancestor through the first of the present Lords of Clancahill.

The families were barely acquainted with each other, and in fact some daughters go unmentioned in many surviving Irish pedigrees.

But the O'Donovans made sure Gyles was celebrated by the poets in their country and her elegy was composed by an Ó Dálaigh.