Thank you Marc. It's safest to review maps closer in time. Street names change quite a bit over the years. For example, here's some information I found out about two of the streets I mentioned: Mercer-str. (York-str.) 1773. >From its proximity to the hospital, for sick poor; erected by Mrs. Mary Mercer, spinster (will, 1733), opened in 1734, incorporated 1750, - on the site of an ancient S. Stephen's Church and Church-yard, and a still more ancient leper hospital. (See S. Stephen-str.) In 1728, the present Mercer-str. (up. and lr.) had been called Love-la. In 1860, the name Mercer-str. up. was given to French-str., q.v. Trinity-la. 1. W. (Near Christ Church Cathedral.) 1190. See Holy Trinity-la. 2. E. = Trinity-str., q.v., 1730. Trinity-str. (Dame-str.) 1728. -ct. 1790. -p1. 1792. From Trinity-hall, - a public free school erected here about 1616. (G. H. D., iii. 8.] Formerly called Trinity-lane (yet still so in 1756). The hill on which S. Andrew's Church stands was also called Trinity-mount. [(G. H. D., iii. 17.] (Cf. Jesus-la. in Cambridge, - and Holy Ghost-la. in Waterford.)