Who is Krona the Warrior from Sarum: The Novel of England and what is their importance?

Krona the Warrior had been a farmer in what is probably now France. He was a peaceful man with a farm and a wife and four children. One day, he returns to his home and finds that it has been attacked by a brutal tribe of marauders. He finds his wife and children dead and all of his livestock taken. Krona vows revenge. Krona banded together men and fought off the invaders for several years. Eventually the men would wear war paint and attack the invaders. He is known for the weapon the carries - an oak club with a spike flint sticking out.