 In any case, it is clear from the architectural evidence that any religious building that may have been on the site prior to that time was greatly expanded during the 15th century.Around 1473, a delegation of Franciscans from Ross Errilly went to Donegal at the request of the Tyrconnell clan and founded the Donegal Friary, where the Four Masters would later write their famous Annals.Life at Ross Errilly was disrupted by the English Reformation.