Erinensis was the pseudonym used by Peter Hennis Green (1803–1870), an Irish physician who edited medical journals and wrote many columns for The Lancet from the 1820s to the 1840s.
[1] In 1840 Green founded the Provincial Medical and Surgical Journal, a weekly, and worked as its responsible editor in London.
At the time a rift had developed between the Lancet and the Provincial Medical and Surgical Association, which no doubt Green wished to take advantage of.
Erinensis's identity remained a secret until the publication of Sir Charles Cameron's History of the Royal College of Surgeons in Ireland, where he wrote that he obtained the information from James Wakley, proprietor of the Lancet.
The Sketches of Erinensis: Selections of Irish Medical Satire 1824-1836 edited by Martin Fallon, London, Skilton & Shaw, 1979