High Quality Content by WIKIPEDIA articles! Apologeticus or Apologeticum is Tertullian`s most famous work, consisting of apologetic and polemic; In this work Tertullian defends Christianity, demanding legal toleration and that Christians be treated as all other sects of the Roman Empire. It is in this treatise that one finds the phrase: "the blood of the martyrs is the seed of the Church" (Apologeticus, Chapter 50).