Well, technically the French did not found Britain - they were Normans.
Who were the Normans? They were Scandinavian vikings who had been raiding France for decades. Eventually the French king decided to offer them lands (now called Normandy) in France if they promised to stop raiding and instead protect the French coast.
Normans were in France since at least 3 generation before the britain invasion. So they were clearly french culturally and they were fully merged with the locals genettically. Also the invading army had troops from nearby french region like Brittany or Anjou.
Well, technically the French did not found Britain - they were Normans.
Who were the Normans? They were Scandinavian vikings who had been raiding France for decades. Eventually the French king decided to offer them lands (now called Normandy) in France if they promised to stop raiding and instead protect the French coast.
Normans were in France since at least 3 generation before the britain invasion. So they were clearly french culturally and they were fully merged with the locals genettically. Also the invading army had troops from nearby french region like Brittany or Anjou.