sentences:  It holds the Primacy of Sardinia.Legend relates how a disciple of Jesus Christ, one Bonifatius, preached the Gospel in Cagliari in the 1st century.There were probably bishops at Cagliari from an early date, however, as Athanasius of Alexandria speaks of previous episcopal martyrs (during the Diocletian persecution most likely) in a letter to his contemporary, the first well-known bishop of Cagliari, Lucifer.