E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Blatant Beast (The).
A dreadful fiend of gods and men, ydrad; type of Common Rumour or Slander. He has 100 tongues and a sting; with his tongues he speaks things most shameful, most unrighteous, most untrue; and with his sting steeps them in poison. Sir Calidore muzzled the monster, and drew him with a chain to Faërie Land. After a time the beast broke his chain and regained his liberty. (Saxon, bltan, to bellow.) (Spenser: Faërie Queene, books v. vi.)