Daily entries from the 17th century London diary
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Hackney was a parish in the ancient county of Middlesex. The parish church of St John-at-Hackney, was built in 1789, replacing the nearby former 16th century parish church dedicated to St Augustine (pulled down in 1798).
http://en.wikipedia.org/wiki/Hackney_(parish)
The pointer on the map appears to be in the wrong place. Hackney is due north a mile or so.