First of all, Giza and Semuna, the presidents of the academies, engaged in the work of committing the Talmud to writing. They availed themselves partly of oral tradition, partly of written notes made by various persons as an aid to memory. As everything which proceeded from the Amoraïc authorities appeared of importance to their successors, they gathered up every utterance, every anecdote which was current in learned circles, so that posterity might not be deprived of what they deemed to be the fulness of wisdom. They made additions for the purpose of explaining obscure passages. In this form, as edited by the Sabureans, the contemporary communities and posterity received the Talmud. The era of the Sabureans witnessed the beginnings of an art without which the sacred writings had remained a sealed book,--the introduction of a system of vowel-points, by means of which the text of Holy Writ became intelligible to the unlearned. This art owes its origin to a faint breath of "scientific research" wafted from dying Greece. Justinian had closed the schools of philosophy in Greece, and the last of her wise men sought refuge in Persia. From them the science of grammar was communicated to the Syrian Christians, these in turn roused in their Jewish neighbors the spirit of emulation in the investigation of the Scriptures, and this led to the adoption of vowel-points and accents. The names of the immediate successors of Giza and Semuna have been preserved neither by the chronicles nor by tradition; they were forgotten in the persecution with which the academies were again visited. In this century Magianism contended with Christianity for the palm of intolerance. Judaism was an abomination to both, and the priests of these two religions, of which the one preached the victory of light, and the other the rule of brotherly love, used weak kings as the instruments of horrible persecutions. Chosroes Nushirvan's son, Hormisdas (Ormuz) IV, was unlike his great father in every respect. His tutor and counselor, Abuzurj-Mihir, the Persian Seneca, is said to have invented the game of chess for this weakly monarch, in order to teach him the dependence of the king on the army and the people. During this philosopher's lifetime the true character of Hormisdas was hidden, but immediately upon his retirement the Nero-like nature of the king broke out, and overstepped the bounds of prudence and moderation.