Ishmael Day's Wikipedia entry. Where it happened -- the Ishmael Day house in the vicinity of Gunpowder Falls. Ishmael Day (1792 - 1873) at FindAGrave.
In my early Maryland family tree, Arthur Taylor's grandson, John Greer, married Sarah Day, daughter of Nicholas and Sarah Day.
Sarah (Day) Greer was the sister of Edward Day, who married "Avarilla Taylor, daughter of John Taylor and granddaughter of Arthur Taylor of Baltimore Co. (Faulkner, 10; St. John's Parish Register, 17-R)... ." "Edward [Day] and Avarilla* lived at Taylor's Mount."
*1 Avarilla Taylor + Edward Day
2 Edward Day
+ Ann Fell
3 Edward Day b: 17 AUG 1759 d: 10 SEP 1842
+ Mary Presbury
4 Ishmael Day b: 20 MAR 1792 d: 27 DEC 1872