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You are a little off in your dates. Tertullian was born approximately 160AD and his writings don’t show up until early in the third century. I’m sorry I said 300 years when I meant third century.
160 Ad is mid second century. Since he died in 220 AD still places his writings within 200 years after Christ (33 AD). Fact is his first writings (Ad Martyras) actually begin about 197 AD - again late 2d century and within 200 years after Christ. Adversus Marcionem is dated around 207-208, once again, well within 200 years of Christ.