DUMNONIA Constantine ap Cado

Abt 0500 - Abt 0589  (89 years)

• Name	DUMNONIA Constantine ap Cado
  Birth	Abt 0500
  Gender	Male
  Death	Abt 0589
  Notes	Disambiguation The following two files are the same person but should not be merged until issues of historicity and legend have been clarified! Constantine or Custennin ab Cado Constantine Biography Notables Project Constantine Dumnonia is Notable. Parenthood Constantine was a son of King Cado / Cato / Cadwy ab Gerren, King of Dumnonia and Duke of Cornwall. Seen in early source material as Custennin or Custennin ab Cado. His mother is not named. Custennin appears as King of Dumnonia and Duke of Cornwall from c. 530 and High King of Britain shortly after. It might be supposed that his father, Cado, was killed or died around this time. 530 High King of Britain Custennin ab Cado (St., Constantine) was the high king of Britain.[1] Constantine is one of the kings attacked by Gildas in the monk's work, On the Ruin of Britain, probably indicating his fame as one of the more powerful of his peers at this time. The king is referred to as a 'tyrant whelp of the filthy lioness of Dumnonia'. The 'filthy lioness' may be a less than flattering reference to his mother. [1] Gildas was not enamoured with the efforts of the British Kings in their endeavours to keep the Saxons from British shores and thus his work is full of disparaging commentary of the Kings of the day. 540 Monastery About 540 Custennin entered a monastery. [1] At some point, c. 560, he enters the monastery and retires for civic duty, leaving the Kingdom to his son, Gerren rac Dehau ('for the South'). The reasons are not provided in source but possibly due to age. 589 Death He was killed in 589. [1] Sources ↑ 1.0 1.1 1.2 1.3 Celtic Kingdoms of the British Isles: Celts of Britain British Kings of Dumnonia Accessed July 20 2018 jhd Source: Wikipedia profile: Constantine (Briton)
  Person ID	I58628	Freeman-Smith
  Last Modified	27 Jan 2026

  
  

  Family
  Children	1. DUMNONIA Bledric ap Custennin,   b. Abt 0550   d. 0613, Bangor-is-Coed, Britain (Age 63 years)  [Father: natural]
  Family ID	F347205	Group Sheet  |  Family Chart
  Last Modified	27 Jan 2026