1596, in reference to the famous London prison, on the site of one of the seven gates in the old London wall (the main gate to the west); this one having been used as a lock-up since the 1100s. So called because it was thought to be more recent than the others (but it apparently dated to Roman times) or because it had been rebuilt at some point. The gate was demolished in the 18c.; the last prison of that name was torn down 1902-3.
Newgate frill, "a beard shaved so as to grow only under the chin and jaw," so called in allusion to the position of the hangman's noose, is by 1851. The author of "The Habits of Good Society" (1859) calls it "a kind of compromise between the beard and the razor."
Both Coleridge and Ruskin praised Thomas Hood's Newgatory.
Hood was addressing the admirable Mrs. Fry, who, as every one knows, set up a school in Newgate to teach the poor neglected outcasts what they had never heard from Christian lips before. One of the chief points made by Hood is this,—how much better, kinder, wiser, more politic even, it would be to multiply these schools outside, not inside the Prison walls, so that prevention might take the place of cure. [Alfred Ainger, preface to "Humorous Poems by Thomas Hood"]
As a literary study, this exquisite pun of Hood's ... deserves the most careful memory, as showing what a noble and instructive lesson even a pun may become, when it is deep in its purpose, and founded on a truth which is perfectly illustrated by the seeming equivocation. [Ruskin, "Fors Clavigera"]