This paper investigates relationships between assembly places and expressions of collective identities among Gaelic elites during the period from the 9^th to the 16^th century in Ireland. I note patterns of continuity and change in users of assembly sites located in the “Midland Corridor” of Ireland, a historically important route between the early medieval provinces of Mide and Munster. Assembly sites, distinguished as exceptional places by their distinctive topographies and funerary aspects, were the focus of displays of ancestral attachment among Gaelic ruling dynasties. Who convened assemblies and where they were held were influenced by deference to mythological identities arising from the pseudo-historical binary cosmography of the island, changes in territorial boundaries, and the tendency for powerful families to dominate.