SOCIETY FOR CONSTITUTIONAL INFORMATION: Marshall Esq of Hackney proposed member 24.11.1786 by Thomas Ridgway 2nded John Baynes
There was a John Marshall in Hackney Land Tax records 1783-1785 and a William Marshall at a different Hackney address 1786-1788. Sorry to say Ive made no further identification, Marshall being a common name.
Work notes
(Possibly Samuel Marshall of Dalston will PCC 20.4.1837 he married Mary Shepherd at Dartmouth in 1790 and lived in Wellclose Sq Whitechapel 1793 when their son Lawrence Jopson was born)