Erika,
"Charles McGarel, a native of Larne in County Antrim, left his slave-derived fortune to his
brother-in-law James MacNaughten Hogg in 1876 on condition that Hogg changed his name (which
he duly did): one of James MacNaughten McGarel Hogg’s first acts after Charles McGarel’s death
was to build a new house, Magheramorne House, on the estate he inherited near Larne and which
had been bought by McGarel in 1842"
http://www.english-heritage.org.uk/publications/slavery-and-british-country-house/slavery-british-country-house-web.pdfThere was a long established connection between Ireland and the West Indies.
[About 75% of the trade out of Belfast in the late 18thC was with that region.]
The big landholders in County Antrim all had estates there (e.g. on Dominica).
[Lord Belfast (CHICHESTER), Lord Hertford (SEYMOUR-CONWAY), Lord Hillsborough (HILL), ...
The paradigmatic country house venue built using profits from the trade is Harewood House just North of Leeds, built by the Lords Harewood (LASCELLES), who stitched up Jamaica (and nearly got tried for High Treason!).]
Papers of Lord Magheramorne (HOGG) are deposited at PRONI under T28-T29 & T758.
http://www.proni.gov.uk/index_alphabetical_index_to_private_deposits.pdf----
Colonel James McCALMONT was a Conservative/Unionist politician, a leading player in the Orange Society (even being depicted on banners), and was fully engaged politically in the efforts to prevent Home Rule during the Ulster Crisis of 1912.
He seems to have acquired the house in 1904.
http://lordbelmontinnorthernireland.blogspot.co.uk/2013/09/1st-baron-magheramorne.htmlCapt. Jock