Ulfberht
Ulfberht is a sword or weapon type.
Overview
Unique Viking swords used throughout Scandinavia.
In detail
Materials recorded for it are crucible steel.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“Ulfberht swords”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q14504750: Ulfberht
Consult the source