Blaise of Sebaste was a 4th-century physician and bishop who lived in historical Lesser Armenia, specifically in the area of modern Sivas. After practicing medicine, he served as a religious leader and spent time as an anchorite in a cave. He is recognized as a hieromartyr following his execution by the governor Agricola under the orders of Emperor Licinius. He is venerated as a saint across various traditions, including Catholic, Eastern Orthodox, and Oriental Orthodox churches.