The early church experienced rapid growth from the 1st to 4th centuries despite facing persecution. Hellenism had spread Greek culture and ideas widely, including in Palestine. Between exile and 70 AD, five major Jewish sects formed including Christians. Common elements united early Christian Jews, like keeping the Sabbath. Christianity also spread due to the Roman Empire's infrastructure and Greek language. Persecution under Nero and Domitian was horrific, leading to the martyrdoms of the apostles and other early Christians like Polycarp and Ignatius. Further persecution under emperors like Septimius Severus and the edicts of Diocletian sought to destroy Christian buildings and books.