Tremorus of Brittany, also known as Trémeur, was a sixth-century child martyr from the region of Armorica. Born into a family where his mother, Triphina, chose to baptize him despite the opposition of his stepfather, he was given the baptismal name Gildas. Following his baptism, he was educated at a monastery in Carhaix under the guidance of Gildas the Wise. He is recognized for his early death, which occurred while he was still a student at the monastery.