One dispute in Irish history which has not been given the attention it deserves is that which involved Britain, Ireland and Portugal during the years 1780-87 Authors of outline Irish histories, Lecky, Murray, George O’Brien and McDowell only mention the dispute briefly in their respective narratives, though it is clear they understood its importance to some degree at least. Maurice O’Connell, who has produced the only specialist study for the period in question, makes no reference to the dispute at all. This dispute has indeed been more substantially treated by the British historian, John Ehrman, within the general context of an analysis of the British government’s commercial negotiations from 1783 to 1793. However, the perspective he draws relates purely to Britain and Portugal, which, in itself, narrows the true significance of an episode which was important in that it completely undermined the benefits Ireland hoped to accrue from the free-trade legislation of 1779-80, and also because it raised a number of interesting questions relative to Ireland’s constitutional status vis-à-vis of Great Britain.