From "Biographical Dictionary of the Maryland Legislature":
JOHN MOORE (?-1791) BORN: probably in Kent County. NATIVE: at least second generation. RESIDED: at "Comegys Farm", Chester or Worton Hundred, Kent County. FAMILY BACKGROUND: BROTHER: Richard SISTERS: Mary; Ann. MARRIED: by 1767 Cassandra Adair (?-by 1798), daughter of Dr. Alexander Adair and wife Christiana Sterling (?-1766) of Calvert County;grand daughter of Thomas Sterling.Her brother was Robert Adair (?-1768).Her sister was Elizabeth. CHILDREN: SON: George PRIVATE CAREER: EDUCATION: literate. RELIGIOUS AFFILIATION: probably Anglican.Early members of the Moore family in Kent County were Anglican.A John Moore sold his pew in Chester Parish, Kent County, in 1769. OCCUPATIONAL PROFILE: farmer PUBLIC CAREER: LEGISLATIVE SERVICE: Lower House, Kent County, 1789, 1790. IDENTIFICATION PROBLEMS: There was one other man who may have been eligible to represent Kent county in the 1789 and 1790 Assemblies: John Moore (?-1812), nephew of John Moore (?-1791). Identification was based primarily on his last date of legislative service, December 1790, and his death before the next legislative session, November 1791.