Rørik Halvdanson, I

http://www.manfred-hiebl.de/mittelalter-genealogie/mittelalter/koen...

https://de.wikipedia.org/wiki/R%C3%B6rik_I.

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

Halfdan had [six] children:

4. RÖRIK [Horik/Heric] (-killed in battle 854). Adam of Bremen names "fratri eius [=Haraldi] Horuch" when recording that he was granted part of Frisia[92]. The Chronicon Roskildense records that "Haraldus rex Danorum…frater eius Hericus et uxor regis" was baptised in 826 at Mainz by "Othgario archiepiscopo"[93]. The Chronicon Roskildense records that "fratrem regis Haraldi…Ericum" succeeded as king "nam mortuo Haraldo"[94]. The Annales Fuldenses record that "Rorih natione Nordmannus", who during the reign of Emperor Louis held "cum fratre Herioldo vicum Dorestadum", was captured in 850[95]. The Annales Fuldenses record the war in 854 between "Horih regem Danorum et Godurm filium fratris eius" in which both were killed, leaving only "unus puer" as the sole surviving member of the Danish royal family[96]. Adam of Bremen records that "Gudurm principe Nortmannorum" challenged "patruo…rege Danorum Horico", specifying that the only survivor of the conflict was "puerum unum…Horicum"[97]. The Chronicon Roskildense records that "Hericum regem" was killed and succeeded by "Hericus puer"[98]. On his death, the kingdom of Denmark seems to have disintegrated[99].