Yet once me thought it [the ghost of Hamlet's father] was about to ſpeake, / And lifted vp his head to motion, / Like as he would ſpeake, but euen the / The morning cocke crew lowd, and in all haſte / It ſhrunke in haſte away, and vaniſhed / Our ſight.

General paresis was described in 1822 by Antoine Laurent Bayle (1799–1858).

Coordinate term: Old World monkey

My diagnosis of his character proved correct.