So very many arrangers of traditional tunes over the years seem to have thought it beneath them to identify the tunes upon which their work depended. Sad, really.

This is a form of the tune commonly known as Farewell to Lochaber, after the (English-language) song Alan Ramsay set to it (Tea-Table Miscellany, 1724). Later in the 18th century, Robert Burns found the first part of the melody being used in Ayrshire tradition for a fragment of Lord Ronald My Son (Child 12F; the earliest known example with a tune). I can't think of any Gaelic texts set to it, but that doesn't mean there aren't any.

It appears that part or all of Lochaber was used by the Irish harper Thomas Connellan (and credited to his composition by O'Neill) as an introduction to his composite piece The Breach of Aughrim (latter part of the 17th century), the central part of which was apparently based on an earlier tune.

More information (not all of it terribly clear in this case, and often contradictory) can be found at The Fiddler's Companion. See also references to Limerick's Lamentation and King James March to Ireland. As early as 1701, a form of the tune had also appeared in Playford's Dancing Master as Reeve's Maggott.