gregory, n. — Green’s Dictionary of Slang

gregory n.

[Gregory Brandon, who worked as executioner under James I (1601–25), to be succeeded by his son Richard, better known as ‘Young Gregory’]

a hangman, thus have breakfast with young Gregory, to be hanged.

1641		H. Walker, Ironmonger An answer to a foolish pamphlet entituled A swarme of sectaries & schismaticks n.p.: [L]et [John Taylor] take heed, lest he peepe through a wooden casement in Cheape-side, or else faire worse in a cart, with a breakfast with young Gregorie.
1654		Mercurius Fumigosus 29 13–20 Dec. 232: A great fray had the same time like to have been between a Black Jack and Gregory about the disposition of a Cloak.