The king of serpents (Greek, basileus, a king), supposed to have the power of “looking any one dead on whom it fixed its eyes.” Hence Dryden makes Clytus say to Alexander, “Nay, frown not so; you cannot look me dead.” This creature is called a king from having on its head a mitre-shaped crest. Also called a cockatrice, and fabulously alleged to be hatched by a serpent from a cock's egg.
Like a boar Plunging his tusk in mastiff's gore: Or basilisk, when roused, whose breath, Teeth, sting, and eyeballs all are death.
King: Art of Love.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894