When the Roman legions left Britain, the Germanic Angles, Saxons, Jutes and Frisians began to arrive . First they came in small invading groups, but soon in increasing numbers. Initially little resistance came from the defenceless inhabitants of Britannia. Around 500 AD, however, the invaders were resisted fiercely by the Romano-British, who might have been led by King Arthur, if he existed. From the fifth century onwards, invading settlers from northern Germany and Scandinavia battled for control of lands that by 1000 had become united as one kingdom of England, fought over by Viking and Saxon kings. Someone travelling around England in 1000 would have heard many languages including Anglo-Saxon, Norse, Welsh, Norman French and Cornish. England was part of Christendom, which meant strong cultural links with the rest of Europe. Trade in goods and ideas brought influences from further afield, too, especially from Muslim North Africa and Western Asia. They had way bigger influence than Romans did - they brought many immigrants and Christianity. St. Augustine was sent by the Pope from Neapol to bring Christianity to Britain.