The name given to those who during the Decian persecution (249-51) purchased certificates from the civil authorities which stated they had sacrificed to idols when in fact they had not. The practice was condemned by church leaders, but those guilty of the circumvention were treated more liberally than those who had actually sacrificed. A council at Carthage in 251 decided that penitent libellatici might be restored, but that sacrificati must submit to lifelong penance.

See Lapsi.