Demiana was a fourth-century Christian martyr from Egypt who is honored for her devotion to celibacy. Following the death of her mother, she was raised by her father, Mark, a governor in the Nile Delta region. Refusing noble marriage proposals, she sought to live a life of religious devotion alongside forty companions. During the persecutions under Emperor Diocletian, she and her followers refused to renounce their faith, leading to their martyrdom. She is regarded as a foundational figure for Coptic Orthodox female monasticism.