From the LCMS website:
Cyprian (A.D. ca. 200–258), was acclaimed bishop of the north African city in Carthage around 248. During the persecution of the roman Emperor Decius, Cyprian fled Carthage but returned two years later. He was then forced to deal with the problem of Christians who had lapsed from their faith under persecution and now wanted to return to the Church. It was decided that these lapsed Christians could be restored but that their restoration could take place only after a period of penance that demonstrated their faithfulness. During the persecution under Emperor Valerian, Cyprian at first went into hiding but later gave himself up to the authorities. He was beheaded for the faith in Carthage in the year 258.