Glenn Máma gave Brian a psychological advantage over the king of Tara and increased his readiness to break the Agreement of Clonfert. As a result of the battle, he had achieved domination, in a meaningful sense, of Leinster and Dublin. Through achieving effective dominance of Dublin, Brian acquired a military (aside from a psychological) advantage over Máel Sechnaill, which helped him in his endeavours to reach beyond the lordship of Leth Moga. His success in this regard was probably instrumental in tying Dublin into the sphere of Leth Moga for at least a century to follow.