brehon
A judge or lawgiver in ancient Celtic Ireland.
historical
a rare and ancient sword named Hrunting.
[T]he brehon handed him a hilted weapon,
Where it comes from
From an Anglicized oblique form (such as genitive singular breitheamhan or dative singular breitheamhain) of Irish breitheamh, from Old Irish brithem, from breth (“judgment”).
Adapted from the Wiktionary entry brehon (CC BY-SA 4.0).