 This forced the erstwhile rulers of Locha Léin - the O'Flynns - to migrate eastwards.Sometime after 1096, Múscraighe Mittaine fell to the O'Flynns .The local Ó Donnagáin dynasty persisted in their opposition to the usurpers, at least until 1115 when they killed the reigning O'Flynn king of Muskerry.