1. The Anglo-Saxon period in Britain:
It ended with the Norman Conquest of England in 1066. · Its duration extended from the end of Roman rule to the Norman Conquest. · The Anglo-Saxon period lasted from 410 until the Norman Conquest in 1066. · It began with the collapse of Roman rule in Britain in 410.
Explanation
The period began in 410, when Roman rule collapsed, and ended with the Norman Conquest in 1066. The proposed start date of 449 is incorrect; the other statements express the established dates and span.