Tertullian: Early Christian writer and controversialist. Perhaps most famous for the quote "The blood of martyrs is the seed of the church." Born a pagan perhaps around 160 C.E. in North Africa, he was trained as a lawyer, and converted to Christianity while probably in his mid-thirties. He wrote many passionate works exhorting outsiders to become Christian -- and exhorting Christians to become more spiritual. This eventually caused him to break away from the orthodox church and become a Montanist. He perhaps died around 220.