When I had returned to Jerusalem and was praying in the temple, I fell into a trance and saw him saying to me, ‘Make haste and get out of Jerusalem quickly, because they will not accept your testimony about me.’ And I said, ‘Lord, they themselves know that in one synagogue after another I imprisoned and beat those who believed in you. And when the blood of Stephen your witness was being shed, I myself was standing by and approving and watching over the garments of those who killed him.’ And he said to me, ‘Go, for I will send you far away to the Gentiles.’” (Acts 22:17-22)We know him best from two songs that have nothing to do with his life or death, but which pertain to his feast day. The more famous is "Good King Wenceslas," which takes place on the Feast of Stephen.
My favorite, though, is the Clancy Brothers' rendition of a song built around an Irish tradition called Wren Day. You can hear their retelling of the tradition starting at about 07:05, followed by a very cheerful song about the sacrificial tradition of wren killings and funerals.