In 468 CE, Rabbi Amemar, Rabbi Mesharsheya and Rabbi Huna, the heads of Babylonian Jewry, were arrested and executed 11 days later. The Jewish community of Babylon had existed for 900 years, ever since Nebuchadnezzar had conquered Israel, destroyed the Holy Temple, and exiled the Jews to Babylon. Seventy years later, when the Jews were permitted to return to Israel, a large percentage remained in Babylon -- and this eventually became the center of Jewish rabbinic authority. Things began to worsen in the 5th century, when the Persian priests, fighting against encroaching Christian missionaries, unleashed anti-Christian persecutions which caught the Jews of Babylonia in its wake. Eventually the situation improved, and Babylon remained as the center of Jewish life for another 500 years.