Origin of Philadelphia lawyerin reference, refer to Andrew Hamilton of Philadelphia, who obtained an acquittal (1735) of J. P. Zenger from libel charges
Philadelphia lawyerPhiladelphia lawyer
Origin of Philadelphia lawyerAfter Philadelphia Pennsylvania
(plural Philadelphia lawyers)
Possibly derived from Andrew Hamilton's skillful defense of John Peter Zenger in 1735, though, as the phrase is not attested until 1788, this is uncertain.