From Wiki:

Aidan of Lindisfarne^[1] (died 31 August 651), known as the Apostle of Northumbria, was an Irish monk and missionary credited with restoring Christianity to Northumbria. He founded a monastic cathedral on the island of Lindisfarne, served as its first bishop, and travelled ceaselessly throughout the countryside, spreading the gospel to both the Anglo-Saxon nobility and to the socially disenfranchised (including children and slaves).

After his death, Aidan’s body was buried at Lindisfarne, beneath the abbey that he had helped found.^[9] Though his popularity waned in the coming years, “in the 10th century Glastonbury monks obtained some supposed relics of Aidan; through their influence Aidan’s feast appears in the early Wessex calendars, which provide the main evidence for his cult after the age of Bede.”^[9]

A detailed biography of Saint Aidan can be found here.