San Efisio is a significant religious figure in Sardinia, Italy, celebrated as the patron saint of the city of Cagliari. His feast day, held on May 1st, honors his martyrdom and is marked by a vibrant procession that attracts thousands of participants and spectators. The San Efisio festival features traditional costumes, music, and a parade that includes a statue of the saint carried through the streets. Pilgrims travel from various parts of the island to pay their respects, making it one of the most important cultural events in Sardinia, showcasing local traditions and community spirit.