Ellen-dún

According to the Old English Dictionary:

Ellan-dún, e;

Ellen-dún

f. [Flor. Ellandun, i. e. mons Eallæ: Will. Malm. Hellendune: Hunt. Elendune] Allington, near Amesbury, Wilts; lŏci nōmen in agro Wiltoniensi :-- Hér gefeaht Ecgbryht cyning and Beornwulf cyning on Ellendúne [Ellandúne, Th. 111, 21, col. 2] in this year Egbert and Beornwulf fought at Allington, Chr. 823; Th. 110, 20. ellen-dun