North out of London Wall at No.129 to Fore Street, opposite St. Alphage Church (P.O. Directory).
First mention: Strype, ed. 1720, I. iii. 92.
Former names:-" Postern," Hatton, 1708. "First postern," Rocque, 1746.
So called from the street of Aldermanbury, of which it is the northern continuation, and as marking the site of one of the old postern gates in the City Wall. This postern was originally called the " Little Postern," but in later years " Aldermanbury Postern."
A Dictionary of London. Henry A Harben. 1918.