There probably existed an educational system among the Jews of Palestine, but it must have been inadequate and unimportant, since, with the exception of Mar-Zutra, not even the names of the teachers are known. Until the time of Justinian the Jews of Palestine and the Byzantine empire, whatever may have been their civil disabilities, enjoyed complete religious liberty; the emperors did not interfere in the affairs of the heart. Justinian was the emperor who, besides imposing greater civil restrictions, first interfered in matters of conscience. It was he who promulgated the disgraceful law that Jewish witnesses were not to be allowed to testify against Christians, and that they were to be considered competent witnesses only in their own cases (532). Compared with the Samaritans, the Jews were a favored class, for the evidence of the former had no validity whatever, and they were not even allowed to dispose of their property by will. This was an act of revenge against the Samaritans, who had several times risen in revolt against the imperial power, and on one occasion had set up a king in the person of Julian ben Sabar (about 530). As the Jews had not taken part in this insurrection, they were favored to a certain extent. Meanwhile, however, Justinian also published an anti-Jewish law. Although the Jews and Samaritans were excluded, like all heretics, from offices of honor, they were obliged by law to assume the onerous and expensive decurionate (magisterial office), without being permitted, however, to enjoy the privileges attached to it, namely, exemption from exile and flogging. "They shall bear the yoke, although they sigh under it; but they shall be deemed unworthy of every honor" (537). Justinian was one of those rulers who, in spite of narrowness of mind and wickedness, have their own opinions on religious matters, and desire to assert them without regard for their subjects' peace of mind. Justinian wished to carry out his views concerning the Christian celebration of Easter, and he therefore forbade the Jews to celebrate the Passover before the Easter of the Christians. The governors of the provinces had strict orders to enforce this prohibition. Thus, whenever the Jewish feast of the Passover preceded the Christian Easter, in the year before leap-year, the Jews incurred heavy fines for holding divine service and eating unleavened bread (about 540).