St. 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 the Roman persecution of Christians. According to legend, she was subjected to various tortures for refusing to renounce her beliefs, ultimately leading to her martyrdom. Her feast day is celebrated on February 12, and she is often depicted in art as a young girl with a palm branch, symbolizing her martyrdom. The Cathedral of Barcelona is dedicated to her, housing her relics and serving as a significant site for pilgrims and visitors.