The Anglo-Saxons also brought their own religious beliefs, but the arrival of Saint Augustine in 597 converted most of the country to Christianity. The Anglo-Saxon period lasted for 600 years, from 410 to 1066, and in that time Britain's political landscape underwent many changes.The Anglo-Saxon period stretched over 600 years, from 410 to 1066... The Anglo-Saxon period stretched over 600 years, from 410 to 1066...The early settlers kept to small tribal groups, forming kingdoms and sub-kingdoms.he Anglo-Saxon period stretched over 600 years, from 410 to 1066... The Anglo-Saxon period stretched over 600 years, from 410 to 1066... The early settlers kept to small tribal groups, forming kingdoms and sub-kingdoms.