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I have only just regestered on this site and found that you were looking to find information regarding your g g grandfather william Johnston.  I have been doing some research for my own family and discovered what may be your connection A william Johnston listed as a game keeper.  This was in a townland of Slievenagravery in the district of Derriaghy (Derryaghey).  The area suggests to me he may have been employed by the Dickson family ie Dickson Estates who owned moorland for grouse shooting.  Stoneyford would have been the nearest village at that time. If this is of any help to you please let me know and I can perhaps give you more details of this area and were to look further.