Question: Halfdan Ragnarsson was a commander of a coalition of Norse warriors, originating from where?
Sentence (from "Halfdan Ragnarsson"): Halfdan Ragnarsson (Old Norse: "Hálfdan" ; or "Healfdene"; Old Irish: "Albann" ; died 877) was a Viking leader and a commander of the Great Heathen Army which invaded the Anglo-Saxon kingdoms of England, starting in 865.
Relevant evidence: Yes