Saint Eulalia of Barcelona is a revered Christian martyr and the co-patron saint of Barcelona. She is believed to have lived in the 3rd century and is known for her steadfast faith during a time of persecution against Christians. According to tradition, she was a young girl who suffered martyrdom for refusing to renounce her beliefs. Her story is celebrated in various ways, including the annual feast day on February 12. The Cathedral of Barcelona features a crypt dedicated to her, and her legend includes miraculous events, such as the appearance of a dove during her execution. Saint Eulalia remains an important figure in the city's religious and cultural heritage.