[29] Saga Book of the Viking Club, VI., i., 23 (Bugge). See also Collingwood, Scandinavian Britain, 109. The federation was later enlarged till it included Seven Boroughs. Anglo-Saxon Chronicle, 1015.
[30] The Danish antiquarian Worsaae found more than four hundred Norse place names in Yorkshire alone. While his list cannot be regarded as final, it will probably be found to be fairly correct. The subject of English place names has not yet been fully investigated. Recent studies are those by F.M. Stenton, The Place Names of Berkshire (Reading, 1911), H.C. Wyld and T.O. Hirst, The Place Names of Lancashire (London, 1911), and F.W. Moorman, The Place Names of the West Riding of Yorkshire (Leeds, 1910).
[31] Steenstrup, Normannerne, iii., 228.
[32] Historians of the Church of York, i., 454.
[33] Historians of the Church of York, i., 455. For a fragment of a lay in praise of Ethelred see Corpus Poeticum Boreale, ii., iii.
[34] Saxo gives the period as seven years (Gesta, 337). But his account is confused and unreliable; seven must be taken as a round number. Still, the period between the renewal of the raids in England and Sweyn's accession covers nearly seven years.
[35] Historians of the Church of York, i., 455.
[36] Steenstrup, Normannerne, iii., 221.
[37] The English were led by the East Anglian ealdorman Byrhtnoth, whose valour and death are told in what is perhaps the finest poem in Old English literature. See Grein-Wülker, Bibliothek der angelsächsischen Poesie, i., 358-373.
[38] For the treaty see Liebermann, Gesetze der Angelsachsen, i., 220-225.