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History.library Point: John Francis Mercer: A Neglected Patriot
An interesting article on the life of the delegate from Maryland to the Constitutional Convention who eventually walked out (along with his fellow delegate Luther Martin) and fell into the anti-Federalist camp.
University of Groningen
American History: Biographies: John Francis Mercer 1759 1821
John Francis Mercer, born on May 17, 1759, was the fifth of nine children born to John and Ann Mercer of Stafford County, VA. He attended the College of William and Mary, and in early 1776 he joined the 3d Virginia Regiment. Mercer...
US National Archives
Nara: Founding Fathers: Maryland
Gives biographical details on the five delegates from Maryland to the Constitutional Convention: Daniel Carroll, Daniel of St. Thomas Jenifer, Luther Martin, James McHenry, and John Francis Mercer.