Konungslykill

As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):

konungslykill

m. the king’s key = axe (which opens all doors and chests); munu þeir bera konungslykil at húsinu, they will break in by force.

Possible runic inscription in Younger Futhark:ᚴᚢᚾᚢᚾᚴᛋᛚᚢᚴᛁᛚᛚ

Also available in related dictionaries:

This headword also appears in dictionaries of other languages closely related to Old Icelandic.

• Old Norse - Cleasby & Vigfusson Dictionary
• Old Norwegian - Johan Fritzner's Dictionary