The Anglo Saxons spoke Germanic languages and were not very good at reading and writing. Instead They used symbols called runes. Whereas the Britains who were pushed westward understood the Roman language of Latin and could read and write.
“Wounded I hung on a wind-swept gallows For nine long nights, Pierced by a spear, pledged to Odhinn, Offered, myself to myself The wisest know not from whence spring The roots of that ancient rood. They gave me no bread, They gave me no mead, I looked down; with a loud cry I took up runes; from that tree I fell.”