Eulalia (c. 289 – February 12, 303), co-patron saint of Barcelona, was a 13-year-old Roman Christian virgin who was martyred in Barcelona during the persecution of Christians in the reign of emperor Diocletian (the Sequence of Saint Eulalia mentions his co-emperor the "pagan king" Maximian).

[2] According to the Orthodox Church in America, Eulalia, age thirteen, was the daughter of a noble family that lived near the city of Barcelona.

Sometime later, Eulalia left her home, entered the city, and publicly confronted the governor for the persecution of Christians.

However, it has been posited that she was instead publicly tortured to death on an X-frame and her body left on display, artistic depictions of which leading to the later belief that she was crucified.

[5] The festival of Saint Eulalia is held in Barcelona for a week around her feast day on February 12.