english history By facebooker_2144364962524680 Period: 6000 BCE to 6000 BCE The British Isles are formed as water levels rise separating them from mainland Europe. Period: 2200 BCE to 2200 BCE The construction of Stonehenge is completed Period: 600 BCE to 600 BCE The Celtic peoples begin to arrive and establish their culture. Period: 55 BCE to 55 BCE Roman leader Julius Caesar invades Britain, but withdraws. Period: 43 to 43 The Roman Empire invades Britain and makes Britannia a Roman province Period: 50 to 50 The Romans found the city of Londinium (which later becomes London). Period: 122 to 122 Roman Emperor Hadrian orders the construction of Hadrian's Wall. Period: 410 to 410 The last of the Romans leave Britain. Period: 450 to 450 The Anglo-Saxons begin to settle in Britain. They rule much of the land until the Vikings arrive.