A presentation often quoted when the subject of Brig Brethach comes up is “Bríg Brethach, ‘Bríg of the Judgements’” by Katharine Simms—the “doyenne of studies of Gaelic Irish society in the later Middle Ages” (1).
This paper can be downloaded here.
(1) Four Courts Press.
Image: ‘La Justice’, Henri-Jean Guillaume Martin (1860-1943). Public domain.