 Loígis is also the name of the territory in western Leinster that the tribe settled during the third century AD, and of the minor kingdom that the Loígis chieftains ruled until 1608.County Laois derives its name from Loígis, although the present county encompasses baronies that were not traditionally part of the territory of Loígis.The name Loígis stems from the name of the tribe's first chieftain, Laigse(a)ch, Laeighsech, or Loígsech.