{{Short description|Medieval Welsh saint}} {{Use British English|date=October 2015}} {{Use dmy dates|date=March 2025}} {{Infobox saint | name = Saint Aerdeyrn | birth_date = c. 6th century | venerated_in = Roman Catholic Church | residence = Wales | patronage = Llanelldeyrn, Wales }}
'''Saint Aerdeyrn''' ({{circa|lk=no|6th}} century) was a semi-legendary pre-congregational saint of Wales. He was a descendant of Vortigern, making him related to the royal house of Powys. He was the brother of Saint Edeyrn and Elldeyrn<ref>John Williams, ''The Ecclesiastical Antiquities of the Cymry; Or the Ancient British Church; Its History, Doctrine, and Rites.'' (John WILLIAMS (M.A., Rector of Llanymowddwy). 1844) [https://books.google.com/books?id=xdhUAAAAcAAJ&pg=PA112 page 112].</ref> with whom he is oft associated. His name was derived from the Celtic word for Prince.<ref>Irish Archaeological and Celtic Society, Irish Archaeological and Celtic Society Publications (Irish Archaeological and Celtic Society, 1848) [https://books.google.com/books?id=TJgxAQAAIAAJ&dq=Aerdeyrn&pg=PA104 page 104].</ref> He built churches in Glamorgan<ref>William Owen Pughe, ''The Cambrian Biography: Or, Historical Notices of Celebrated Men Among the Ancient Britons'' (William Owen Pughe, 1803) [https://books.google.com/books?id=WGBIAAAAYAAJ&dq=Aerdeyrn&pg=PA3 page 3].</ref> and he is the patron Saint of Llanelldeyrn, Wales.<ref>Rev. Rice Rees, ''An Essay on the Welsh Saints or the Primitive Christians who were Founders of churches in Wales'' (Longman, 1836) [https://books.google.com/books?id=NtIAAAAAcAAJ&dq=Aerdeyrn&pg=PA132 page 132].</ref>
==References== {{Reflist}}
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{{DEFAULTSORT:Aerdeyrn, Saint}} Category:Welsh royal saints Category:5th-century Welsh people Category:5th-century births Category:Welsh Roman Catholic saints Category:Year of birth unknown Category:Year of death unknown