Anulo Halfdansson

http://fmg.ac/Projects/MedLands/DENMARK.htm#Halfdandied810B

Halfdan had [six] children:

2. ANULO [Ali] (-killed in battle Haithabu 812). Although the primary source which confirms that Anulo was the son of Halfdan has not yet been identified, the sources cited below indicate that he was "nepos" (grandson?) of King Harald. Einhard's Annales record that news of the death of "Hemmingus Danorum rex" arrived in 812, that "Sigifridus nepos Godofredi regis et Anulo nepos Herioldi quondam regis" both claimed the succession, and that the faction supporting "Anulonis" was victorious, with "fratres eius Herioldum et Reginfredum" being installed as kings[54]. The Annales Fuldenses record the death in 812 of "Hemmingo Danorum rege", the succession dispute between "Sigifredo nepos Godofredi regis et Anulo nepos Herioldi", the battle in which both were killed but which Anulo's supporters won, and the accession by "Herioldum et Reginfredum fratres eius regis"[55]. Described as the nephew of "Heriold and of the former king", the latter presumably being King Hemming, he disputed the succession on King Hemming's death but was killed fighting the rival claimant Sigfrid[56]. Adam of Bremen names "Sigafrid et Anuleo, nepotes Godafridi" when recording that they fought to succeed after the death of King Hemming[57].

http://da.wikipedia.org/wiki/Anulo/Ole/Olav