 These texts were the foundation of the Jerusalem Talmud, which was redacted in around 400 CE, probably in Tiberias.Continued persecution and the economic crisis that affected the Roman empire in the 3rd-century led to further Jewish migration from Palestine to the more tolerant Persian Sassanid Empire, where a prosperous Jewish community existed in the area of Babylon.Early in the 4th century, Roman Empire split and Constantinople became the capital of the East Roman Empire known as the Byzantine Empire.