Janasz, Adolf, proprietor of an estate at Ploch, near Warsaw, having together with his father embraced Christianity, and then afterwards married the daughter of the L.J.S. missionary Rosenthal, henceforth devoted himself to good works and especially to promote Christianity among the Jews by word and deed. In 1863, after the Polish revolution, he founded an orphanage on his estate, which he maintained at his own expense. He also appointed a Bible-woman in Warsaw to visit the Jews, and always showed sympathy and rendered practical help to the missionaries, and sent from time to time considerable contributions to the L.J.S. He published a little excellent work in German, entitled "Die Zukunft des Volkes Israel," Berlin, 1882.
Jany, a Jewish officer who served in the Prussian army from 1806 to 1815, afterwards embraced Christianity, and then devoted himself especially, till the age of 90, to the care of the deaf and dumb, and was one of the presidents of the Deaf and Dumb Institution at Königsberg.
Jasu, was one of the three Falasha converts who carried on the work of the mission during the imprisonment of the missionaries in Abyssinia.
Jedida, Hirsch Leib, Smlinsky, born in Gragewo, Russia, 1847. After being strictly brought up and becoming Bar Mitzvah (confirmed) at the age of 13, he studied at several rabbinic schools for five years, and at last at Plotzk, where he formed a firm friendship with another Bachur (student), by the name of Samuel Nasielsky, a native of Warsaw. They both thirsted for knowledge and studied diligently. The other had one day to return home, on account of the illness of his mother, and Hirsch soon followed him. In Warsaw they came in contact with the missionary Ifland, who showed them another source of knowledge besides the Talmud, and which alone could satisfy not only their minds but also their souls. Having read the New Testament, they were convinced that Jesus was their Saviour. They resolved now to go to Germany together. Before doing so they met with a monk, who tried to win them for the Church of Rome and as they were not able to answer all his objections to Protestantism, the result was, that they read the New Testament more diligently and earnestly. Hirsch was further instructed by Ifland, and was baptized in the Reformed Church at Warsaw, by Superintendent Splasczynsky in 1864, when he received the name of Jedida (beloved of the Lord). His fervent prayer before his baptism is recorded, but it is too long to reproduce here. His friend, who had hitherto been hindered by his family, now joined him, and they travelled together to Bromberg, where they were welcomed by the missionary Koppel into his home at Salem. His parents came to fetch him home, but he returned. Here Samuel was also further instructed, but as Jedida got ill, he was sent to the Hospital Bethany at Berlin, and he followed him there, where he was baptized in 1866, and received the name of Luria, and very often visited his sick friend, to whom he was attached, like David to Jonathan. But Jedida's earthly pilgrimage now drew to a close, yet, before his departure, he composed a Hebrew prayer as follows:—"O Lord! watch over my bed when my end draws near and my soul departeth. Stretch Thou forth Thy hands to receive and to bring it into Thy habitations. Place me among the heirs of Thy kingdom. Satisfy me with Thy comfort and salvation. Make me to rejoice in the light of Thy countenance, that I may ever live with Thee. Amen." The Lord answered his prayer and gave him grace and strength to endure excruciating bodily pains calmly and resignedly, and took him to Himself in September, 1867. His friend followed him three years later and was buried at his side.
Jertes, Dr., known to the Rev. F. W. Becker, laboured with great blessing as a missionary at Frankfort-on-Main in 1838.
Jesaia, Paul, an educated Jew of Prague, after showing an inclination towards Christianity at home, went to London on business about the middle of the seventeenth century, where he came in contact with true Christians. The Jews being then few in number in the city, intercourse between them and Christians frequently took place on very friendly terms. In Bohemia there arose a false Messiah who deceived the people. On his way to London, a Jesuit at Antwerp tried to convert him to Roman Catholicism. All this contributed to his searching for the truth, and when he found it in the English Church, he at once joined it by baptism. Then he wrote a treatise under the title, "A Vindication of the Christian's Messiah," London, 1654. (Wolff, Bib. Heb. 4. N. 1811. d.)
Joachim, Joseph, born in Kittsee, Hungary, 1831, is known to have embraced Christianity. He became a famous musician on the violin, and founded a high school for music at Berlin in 1867.
Joachimsthal, born in Goldberg, 1818, was baptized by Pastor Schultz in Berlin, 1842. He became eventually Professor of Mathematics in Berlin and in Halle. He died in 1861.
John, Evangelist, was one of those Jews baptized at Constantinople about 1827-8, in the time of Wolff, when they were put in prison and bastinadoed.
Jolberg, Madam Regine Julie (née Zimmerman), was born at Frankfort-on-Main in 1801. Her father was a wealthy man, and sent her at the age of thirteen to a Christian school at Heidelberg, where she received good impressions. In 1821 she married a Jewish lawyer, named Dr. Neustetel, and they settled at Hanau. There the seed sown in her heart at school began to spring forth, her husband too was influenced by her and by an evangelical pastor who visited him in his sickness, and he wished to be baptized, but died before he could realise his wish. She gave him a Christian burial. Subsequently, in 1826, she was baptized with her children, and married her former teacher, S. Jolberg. Her second husband died three years later, and soon after the children she had by him. Then she went to the village of Berg, near Stuttgart, in 1831, with the two children of her first husband, and there her Christian faith was strengthened and deepened by the circle of Christian friends around her. In 1841 she took a house at Leutsheim, where she instructed children in knitting. This school became later an asylum for poor children. This was four years after enlarged to admit a branch for the education of teachers. Six years later, in 1851, she hired a small castle in Nonnenwier, with garden and woods, from Baron Bücklin, because she had already eighty nurses under her instruction and supervision. This institution prospered and became well known, so that her example was followed in different parts of Germany and other countries. After 25 years labour there were 300 Nonnenwier sisters in Germany and abroad, and 260 nurses for children. She became known in Germany as Mutter Jolberg, and rightly so, for indeed she was a mother in Israel.