Short answers, pulled from the story.
Tertullian was a prolific early Christian author from Carthage in the Roman province of Africa, living approximately 155-220 AD. He was the first theologian to write extensively in Latin, earning him the titles "father of Latin Christianity" and "founder of Western theology." He is most famous for being the first Latin writer known to use the term trinity (Latin: trinitas).
The phrase expressed Tertullian's opposition to using Greek philosophy as a foundation for Christian theology. He believed philosophy supported religious idolatry and heresy, and that many people had become heretical by relying on it. For him, the rational traditions of Athens and the scriptural authority of Jerusalem were fundamentally incompatible.
Around 207 AD, Tertullian was attracted to the Montanist movement, but most modern scholars reject the assertion that he left the mainstream church or was excommunicated. The North African form of Montanism he encountered accepted Catholic bishops as apostolic successors and the New Testament as supreme authority, differing from Montanism's original form.
Thirty-one of Tertullian's works are extant, along with fragments of more. At least fifteen other works in Latin or Greek are lost. The earliest surviving manuscript of any of his writings dates to the eighth century, while most surviving copies date to the fifteenth century.
The Apologeticus, addressed to Roman magistrates, is widely regarded as the most significant of his apologetic writings. It defended Christianity against pagan charges, proclaimed freedom of religion as an inalienable human right, and demanded fair trials for Christians before condemnation to death. The phrase "the blood of the Christians is seed" comes from this work.
Tertullian advised postponing the baptism of infants, warning that early baptism risked a child later falling into sin and losing salvation. His De Baptismo contains the earliest known mention of a prayer for the consecration of baptismal waters. On marriage, he labeled second marriage a species of adultery and praised celibacy as the highest state, views that influenced much of the later Western church.