Bartrum's note: All the genealogical MSS., from the earliest extant, misidentify Cadwgon of Nannau with Cadwgon ap Bleddyn ap Cynfyn. D 49,however, leaves a space for two names between Madog, father of Meurig, and Cadwgon ap Bleddyn. G 140 gives Cadwgon of Nannau a distinct wife. The most probable correction is 'Madog ap Cadwgon of Nannau ap Madog ap Cadwgon ap Bleddyn'