Saint Efisio is a Christian martyr celebrated primarily in Sardinia, Italy. He is known for his dedication to spreading Christianity and is believed to have been executed in the 3rd century. His feast day is observed on May 1st, attracting many pilgrims and visitors to honor his legacy. The most notable celebration in his honor is the Festa di Sant'Efisio, which takes place in Cagliari. This festival features a colorful procession, traditional costumes, and various cultural events, showcasing the rich heritage of the region. The event highlights the importance of Saint Efisio in local history and spirituality.