The document summarizes the history of Britain from its conquest by the Romans in 55 BC until the Anglo-Saxon period from 449-1066 AD. It describes how the Romans introduced cities, roads, and Christianity before abandoning Britain in 449 AD, leaving it open to invasion by Germanic tribes like the Angles, Saxons, Jutes and Frisians. These tribes organized the area into several kingdoms and introduced their pagan culture before converting to Christianity in the late 6th-7th centuries. Monasteries played a key role in spreading Christianity and literacy. The Danes later invaded parts of eastern and northern England but were eventually defeated by King Alfred the Great in 878 AD.