Eustochius was a 5th-century bishop who served as the fifth leader of the see of Tours from 443 to 461. Born into a distinguished family from Auvergne, he was noted for his significant moral character. During his tenure, he played a major role in the Council of Angers in 453, where he helped establish various disciplinary regulations. He was eventually succeeded in his position by a relative, Saint Perpetuus.