Cammán's daughter was Dub-Lacha,
 The beloved of Mongán, their offspring was good,
Colgo, Conall, that were folk of strength,
Cáintigern was his gentle mother.
Daughter of Demmán's son was Dub-Lacha
Of the white arms, without fault, of yore.'
 Cammán Dub, the daughter of Furudrán mac Bécce, of the royal race of the Ui Turtri, was the wife of Fiachna Dub mac Demmáin (LL: 140 a, 27).
Unless máthair mall may mean 'grandmother,' we must translate as I have done, and refer the a 'his' to Mongán.
 As to Dub-Lacha being called 'of the white arms,' cf. her by-name Láimhghel, p. 61, 10 above.