Heydeck, Don Juan, was before his conversion to Christianity a rabbi in Germany, and afterwards professor of Oriental languages at the University of Madrid. In 1792 he published a work in three vols. entitled, "Defense de la religion Christiana," in which he reputed the errors and attacks of Voltaire and Rousseau. This work next to the Bible was the means of convincing Dr. Cappadose and Da Costa of the truth of the Gospel. In 1807 Napoleon convoked a great Jewish Sanhedrin, when some of the delegate rabbis were exuberant in their flattery of him as if he had been the Messiah. Thus the Italian Rabbi Segri, in an oration in honour of Napoleon's birthday said: "Truly a supernatural genius appeared upon earth, invested with greatness and infinite fame." _Et ecce cum nubibus coeli quasi Filius hominis veniebat et dedit ei potestatem et honorem et regnum_ (Dan. vii. 13). R. David Zinsheimer, of Strassburg, applied to him in a sermon, Isa. xlii. 1, 4, 6. Another Italian rabbi opened the sitting with a speech in which this passage occurs in reference to Napoleon. _Le genie createur, qui parmi les mortels est le mieux formée à l'image de Dieu, en suit les traces sublime._ It was then that Heydeck wrote to them, "If the Son of Man shall make you free, ye shall be free indeed" (John viii. 36.) (See "Christen und Juden," by Dr. A. Fürst, p. 202. See also the "Missionary Journal" of Dr. Joseph Wolf, 1824, containing a letter of Heydeck to a friend of Wolf in England, in which he expresses great interest in Wolf's journey to Jerusalem, and asks his correspondent to tell him that it is his wish that he may become like Joseph in Egypt, a deliverer of his brethren according to the flesh.) Henekstein, Alfred Freiherr Von, born at Ober Dobling, Austria, 1810, died in Vienna, 1882. He was the son of the banker Joseph Von Henekstein, and embraced Christianity in 1828. Joining the army in the same year, he was gradually promoted, until in 1869 he was appointed Chief of the General Staff. As such he acted under Benedek in the Austro-Prussian war, when the Austrian army, through the blunders of commanding officers, was defeated, and he and his superior were arrested to appear before a court-martial. After some time the court was dismissed without having given judgment. Leaving the army, Henekstein passed the rest of his life in retirement in Vienna. Hess, Ernst Friedrich, lived in the sixteenth century. He was the author of a controversial book entitled, "Neue Juden-geissel," cited as "Flagellum Judæorum." (Fritzlar, 1589.) (Strack, "Sind die Juden Verbrecher," p. 7.) Ibn Vives, Juan, grandson of one of the richest Jews of Valencia, was the author of a book entitled, "Veritate Fidei Christianæ." It is asserted in the "Jewish Encyclopædia" that he did this in self-defence, because he was condemned in 1510 for Judaizing, but no proof is given. Iolante, a converted Jewess, married Dam Luis, brother of Henry, King of Portugal, in the sixteenth century.