St. Crispinian of Rome is a Christian martyr celebrated for his faith during the early centuries of Christianity. He is often associated with the persecution of Christians under the Roman Empire, particularly during the reign of Emperor Diocletian. His feast day is observed on October 25. Crispinian is known for his steadfastness in the face of adversity and is often depicted in art as a symbol of courage. He is sometimes confused with St. Crispin, who is also a martyr and is celebrated on the same day. Both saints are venerated for their commitment to spreading Christianity despite the risks involved.