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258  w endy davies 
in northern  Brittany,  sometime  in the  period  511–558, who killed  the  local 
‘hereditary’ ruler Jonas and displaced him until Jonas’ son Idwal was instated. 
Nowitso happens that Idwal’s dynasty was associated with the Breton province 
of Dumnonia. Is it possible that the British Dumnonian king went adventuring 
across  the  Channel?  And  is  it  possible  that  this,  or  a  similar  adventure,  is 
responsible for the transfer of the name ‘Dumnonia’ from the island of Britain 
to the continental mainland?
73 
The fact that we cannot be sure about so major an item as cross-Channel 
political connections emphasises how little material we have from or about 
Brittany  in  the  sixth  and  seventh  centuries.  There  is  some  background  of 
Armoricans ‘in revolt’ against imperial authorities in the fifth century and of 
people coming from Britain to settle in the peninsula. There were certainly 
enough Britons on the continental mainland by 461 to warrant representation 
by their own bishop in the diocese of Tours; and by 567 there were enough 
of them in Armorica to be a significant cultural group, distinguished from 
the ‘Romans’.
74 
Continental writers who died in the last decade of the sixth 
century had the habit of calling the peninsula Britannia. 
ForGregory of Tours Brittany began at the River Vilaine, the river that 
rises well to the east of Rennes, runs through the city and then south to the 
coast, 30 kilometres west of the Loire mouth; the Roman civitates of Riedones 
and Namnetes, which approximate to the medieval counties of Rennes and 
Nantes, and the modern d
´
epartements of Ille-et-Vilaine and Loire Atlantique, 
largely lie to the east of that boundary. From Gregory we know quite a lot 
about the problems that the Bretons had with the Franks in the 560s, 570s and 
580s.
75 
The Franks claimed to rule Brittany: they marched into it, and pitched 
their tents along the Vilaine; they formally handed the city of Vannes to the 
Breton ‘count’ Waroch, in return for an annual tribute; they took hostages 
and sureties. The Bretons for their part attacked Rennes and Nantes again and 
again, seizing the grape harvest from the Loire vineyards and rushing back to 
Brittany with the wine; Waroch kept ‘forgetting’, as Gregory so disarmingly 
puts it, the agreements he had made. The interaction was clearly violent and 
disruptive. But it was equally clearly limited to quite a small area in south-east 
Brittany. Nothing suggests that the Franks ever went to the west, or even the 
centre, of Brittany (Gregory speaks of them reaching the Oust, a tributary 
of the Vilaine, as if it were some far outpost) and they quite clearly did not 
73 
Vita Pauli c.8;Bartrum (1966), p. 45; Radford (1951), pp. 117–19; Vita Samsonis i, c.59;cf. La Borderie 
(1896), i,pp. 459–69.Some of this material is worked into the later medieval story of Tristan; see 
Pearce (1978), pp. 152–5;Padel (1981), pp. 55, 76–9. 
74 
See above, pp. 235–6. 
75 
Gregory, Hist. iv.4, 20,pp. 137, 152–4; v.16, 26, 29, 31,pp. 214, 232–6; ix.18, 24,pp. 431–2, 443–4; 
x.9;pp. 491–4.See also Fouracre, chapter 14 below.