The original mainland territory of the "Gall Gaidheil" appears to have been much more expansive than Galloway. The ninth-century "Félire Óengusso Céli Dé" and the ninth-century "Martyrology of Tallaght" reveal that Bute, an island of the Firth of Clyde, was encompassed within the territory of the "Gall Gaidheil". This evidence could indicate that the original territory of the "Gall Gaidheil" lay within the Firth of Clyde region and nearby Cowal. In the mediaeval period, the Rhinns appears have also included what is today known as the Machars. The entire region would have thus stretched from the North Channel to Wigtown Bay, and would have likely encompassed an area similar to the modern boundaries of Wigtownshire. The evidence of Echmarcach's authority in the Rhinns may reveal that much of what came to be known as Galloway was originally separate from the "Gall Gaidheil" territory. This could mean that the Rhinns was not part of the "Gall Gaidheil" territory during Suibne's "floruit", and only came to be incorporated into these lands at a later date, perhaps the twelfth century.