It has been argued that Nechtan son of Derile should be identified with the Nechtan son of Dargart mentioned in the
Annals of Ulster in 710. Dargart is taken to be the
Dargart mac Finguine who died in 686, a member of the
Cenél Comgaill kindred of
Dál Riata. On this basis, and because
Bede mentions that the Picts allowed for matrilineal succession in exceptional cases, it is thought that
Der-Ilei (Bridei III) was Nechtan's mother. Other brothers and half-brothers of Nechtan and Bridei would include Ciniod or Cináed, killed in 713;
Talorcan son of Drestan, a half-brother or foster-brother and king of
Atholl, held captive by Nechtan in the same year and executed by drowning in 739, and perhaps Congas son of Dar Gart who died in 712. A number of later figures, including the Talorgan son of Congus, defeated in 731 and likewise drowned in 734, and his unnamed brother, may be associated with Nechtan's family. Bede claimed that relations between the Picts and
Northumbria were peaceful in his time. However, the Annals of Ulster for 711 report a Pictish defeat at
Northumbrian hands, "in Mag Manonn", presumably in the area around
Stirling where the kingdom of Manau had once been, where Finnguine son of Deile Roith was killed. Nothing more is known of Finnguine, but as he bore Nechtan's paternal grandfather's name, it may be that he was a kinsman of the Pictish king. == Religious reforms ==