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Saint Tremeur, a 6th century Breton saint, who was murdered, whilst still a youth, in the monastery of Rhugs (Morbihan) by his father. He has been invoked, even in England, since the 7th century. Invoked for head pains. Represented carrying his head. Wellcome Collection. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.