Saint Greca was a Christian woman born in 284 in Decimomannu, located on the island of Sardinia. During the Diocletianic Persecution, she faced severe physical torment, including being whipped and having nails driven into her head. To conclude her suffering, she was eventually beheaded. She died in 304, leaving a legacy as a martyr of the early Church. Her existence is supported by historical findings, including a tombstone discovered in 1560 and early written references dating back to 1413.