seannachie
A bard, genealogist, or storyteller in Gaelic culture.
Take a glass of wine, Sir Arthur, and drink down that bead-roll of unbaptized jargon, that would choke the devil - why, that last fellow has the only intelligible name you have repeated - they are all of the tribe of Macfungus - mushroom monarchs every one of them; sprung up from the fumes of conceit, folly, and falsehood, fermenting in the brains of some mad Highland seannachie.
Where it comes from
From Irish seanchaí and Scottish Gaelic seanchaidh, from Old Irish senchaid.
Adapted from the Wiktionary entry seannachie (CC BY-SA 4.0).