It has been suggested that a report of a struggle for the Danish crown may have given rise to the legend of Sigurd Ring. Following the death of Hemming in 812, a civil war broke out between his brother or cousin Sigifridus and Anulo. This Anulo was the nephew or grandson ("nepos") of an earlier king Harald. The rivals fought a battle for the succession in which both were killed. The names Sigfred and Sigurd were often conflated in medieval texts. As for Anulo, the name might originally represent Old Norse Ánleifr or Áli, though it was misunderstood by medieval Scandinavian chroniclers as Latin "annulus" which means ring. Saxo Grammaticus and some other medieval compilers of king lists clearly combine the names Sigfred/Sigurd and Anulo/Ring into one person, having received knowledge of 9th century historical events from the chronicle of Adam of Bremen (c. 1075). Their historical successor Ragnfred (r. 812-813) is mixed up by Saxo with the Viking leader Ragnar Lodbrok, who is identified as the son of Sigurd Ring. The Danish list of early Viking Age kings is therefore in part a High Medieval construction.