Note 54 — VI The Common Speech
Reading edition
Henry Bradley, in The Making of English, pp. 54-5: "In the parts of England which were largely inhabited by Danes the native pronouns (i. e., heo, his, heom and heora) were supplanted by the Scandinavian pronouns which are represented by the modern she, they, them and their." This substitution, at first dialectical, gradually spread to the whole language.