Aonghus mac Úmhór

Medieval and early-modern sources present Aonghus mac Úmhór as an eponymous leader of the Tuath mhac nUmhoir and ruler of the Fir Bolg of Connacht. According to the tradition preserved in such sources, after being driven out by warfare with Clann Chuian and the kindred of the Gaoidhil (Gaels) he led his people to the coast of Galway Bay and the Aran Islands, where he is credited in legend with founding or occupying sites including Dún Aonghasa on Inishmore. Modern scholars (for example O'Rahilly) have attempted to historicize these traditions and have proposed dates (O'Rahilly places events in the 2nd century BC), but such datings are scholarly reconstructions rather than direct claims from the medieval sources.

The surviving summaries and genealogical accounts do not preserve a physical or supernatural description of Aonghus mac Úmhór. He is treated in the sources as a legendary/mortal ruler and ancestral figure rather than as a described supernatural apparition, and no contemporaneous physical details are recorded in the cited material.

Sources attribute to Aonghus political and military leadership: he led the Tuath mhac nUmhoir to new territory after being expelled by warfare, ruled the Fir Bolg of Connacht, and is linked etiologically to place‑names and fortifications (legend states he built Dún Aonghasa). His actions recorded in the tradition are political and foundational; the provided materials do not ascribe supernatural powers or magical abilities to him. He is also named as father of Conall Caol, who settled in the kingdom of Aidhne with his people.