Final answer:
The settlers who were driven out of England into Wales were the Anglo-Saxons. King Alfred of Wessex is considered their greatest hero.
Step-by-step explanation:
The settlers of Britain who were ultimately driven out of England into Wales were the Anglo-Saxons. The Anglo-Saxons were Germanic invaders from present-day northern Germany and Denmark. They fought against the native Britons, the Cornish, the Welsh, and each other. The greatest hero of the Anglo-Saxons is considered to be King Alfred of Wessex who managed to defeat the Danes substantially in 878.