The Battle of Ringmere was fought on 5 May 1010 between an East Anglian contingent led by Ulfcytel Snillingr and a Danish army under Thorkell the Tall.

Norse sagas recorded a battle at Hringmaraheiðr; Old English Hringmere-hǣð, modern name Ringmere Heath.

[1] The Anglo-Saxon chronicle records that the English were routed by the flight of Thurcytel "Mare's head", and only the men of Cambridgeshire stood to fight.

[1] In his Víkingarvísur, the poet Sigvat records the victory of Saint Olaf, fighting alongside Thorkell the Tall Enn lét sjaunda sinni sverðþing háit verða endr á Ulfkels landi Ôleifr, sem ferk máli.

Stóð Hringmaraheiði (herfall vas þar,) alla Ellu kind (es olli arfvǫrðr Haralds starfi).