virgin martyr of the early church and patroness of artillerymen. According to legend, which dates only to the 7th century, she was the daughter of a pagan, Dioscorus, who kept her guarded to protect her beauty from harm. When she professed Christianity, he became enraged and took her to the provincial prefect, who ordered her to be tortured and beheaded. Dioscorus himself performed the execution and, upon his return home, was struck by lightning and reduced to ashes.

Some accounts name the ancient Egyptian city of Heliopolis, others Nicomedia or a town in Tuscany, as the scene of her sufferings. The original Greek accounts of her martyrdom are lost, but Syriac, Latin, and other versions are extant. Her story, reproduced in great detail in Jacobus de Voragine's Legenda aurea (1255–66; Golden Legend, 1483), was popular in the Middle Ages.

Venerated as one of the 14 Auxiliary Saints (Holy Helpers), she is invoked in thunderstorms. Because Barbara's authenticity is highly questionable and her legend is probably spurious, she was dropped from the church calendar in 1969.