The 1900 Census for Kennebunkport lists Joseph Titcomb as 65, occ: Capitalist, POB: MA, residing with his wife Frances, age 61, daughter Elizabeth, age 22, and a boarder, Dr. Julia C. Leon, Black, F, 72, single, POB: Cuba
Since she was born in Cuba circa 1828, and slavery did not end there until 1886, Dr. Leon may have been enslaved in her youth.
Bibliography:
1900 US Census for Kennebunkport