His dealings with the saint were believed to account for his descendants' lack of importance in later times.
There are several accounts of his death, all of which contain supernatural elements, some of which concern his wars against Leinster.
The Irish annals purport to record events in the fifth century, but their reliability is doubtful as such early entries were added in the ninth century or later.
The chronology of the annals is particularly suspect as it is believed that this was created retrospectively to match what were believed to be the dates of Saint Patrick with the kings named by Patrick's earliest hagiographers, Muirchú moccu Mactheni and Tirechán.
For the later date, Lóegaire's son Lugaid appears to have served the same adversary role.
In late prehistoric times, beginning in the fifth century, the ancestors of the Uí Néill—descendants of Niall of the Nine Hostages—expanded into the east midlands of Ireland, southern Ulster and northern Leinster, at the expense of the previous overlords.
Tírechán, however, does allow that Patrick converts two of Lóegaire's daughters, Eithne the fair and Fedelm the red.The Irish annals and king lists include him as a King of Tara or High King of Ireland.He appears as an adversary of Saint Patrick in several hagiographies.Southeastern Ceremonial Complex, Southeastern Ceremonial Complex, 0817315543, 0-8173-1554-3, 978-0-8173-1554-2, 9780817315542, , , Southeastern Ceremonial Complex, 0817354093, 0-8173-5409-3, 978-0-8173-5409-1, 9780817354091, , , Southeastern Ceremonial Complex, 0817381368, 0-8173-8136-8, 978-0-8173-8136-3, 9780817381363, A timely, comprehensive reevaluation of the Southeastern Ceremonial Complex.One of the most venerable concepts in Southeastern archaeology is that of the Southern Cult.Patrick is said to have met Lóegaire's daughters near Cruachan, a complex of prehistoric sites associated with the kingship of Connacht in legend and in history.According to king lists, the earliest of which is dated on internal evidence to the reign of Fínsnechta Fledach (died 697), Niall was succeeded by Lóegaire, who was in turn followed by a second son of Niall, Coirpre, Coirpre by Ailill Molt, one of the few kings not descended from Niall, and Ailill by Lóegaire's son Lugaid.This work presents new data and new ideas on the temporal and social contexts, artistic styles, and symbolic themes included in the complex. It also demonstrates that engraved shell gorgets, along with other SECC materials, were produced before A. Lóegaire (floruit fifth century) (reigned 428–458 AD, according to the Annals of the Four Masters of the Kingdom of Ireland)(died c.462), also Lóeguire, is said to have been a son of Niall of the Nine Hostages.