Analysis of information sources in references of the Wikipedia article "Vikingetidens rustning og våben" in Danish language version.
Ch. 10. It has been enacted that no bishop or abbot or abbess, or any rector or guardian of a church, shall presume without our permission to give or sell a byrnie or sword to any man outside, except only to his own vassals.
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: CS1-vedligeholdelse: Arkivtitel brugt (link): "Picture: The world's only existing Viking Age helmet, from Gjermundbu in Ringerike"{{cite web}}
: CS1-vedligeholdelse: Arkivtitel brugt (link): "Picture: The world's only existing Viking Age helmet, from Gjermundbu in Ringerike"