Blackditch was an old landholding which belonged to the see of Dublin. In 1331 it is recorded that the Archbishop of Dublin had the land partly tilled and partly set in grazing. In 1435, the land , under the name of "Og Baliniknegan" was leased to Thomas Sanguine, a Dublin city butcher. One of the fields mentioned in the lease was "Baron's Meade" which had a boundary described as "The Trench". It is from this "Trench" or "Ditch" that the place name Blackditch is drived.

This is the upper end which leads into area four.and runs along by St Matthews Church.