Aelhaiarn

Saint Aelhaiarn
Saint Aelhaiarn with a cowbell (from a 15th-century stained-glass window in Plogonnec, Brittany)
Born	Powys
Died	7th century Llŷn
Canonized	Pre-Congregation
Major shrine	Guilsfield Llanaelhaearn
Feast	2 November (lapsed)
Patronage	Guilsfield Llanaelhaearn

Saint Aelhaiarn or Aelhaearn (Welsh for "Iron Eyebrows";fl. early 7th century) was a Welsh confessor and saint of the British Church. He was a disciple of Saint Beuno. His feast day was usually observed on 2 November, although it is sometimes recorded as the 1st and is no longer observed by either the Anglican or Catholic church in Wales.

Saint Aelhaiarn is listed among the Bonedd y Seint (Genealogies of the Saints). He was the brother of saints Llwchaiarn and Cynhaiarn and son of Hygarfael or Cerfael, son of Cyndrwyn, a prince of the Powysian dynasty descended from Vortigern, king of Britain. The area of Cyndrwyn's control was centred on the Severn valley around Shrewsbury. Aelhaiarn was said to have been a disciple of Saint Beuno, who also a member of the dynasty and thus a cousin. Beuno's activity was sponsored by Cadfan and other members of Gwynedd's Cuneddan dynasty; Aelhaiarn seems to have accompanied him out of Powys to Edeirnion and thence to northeastern Llŷn.