I have already spoken of Simhah ben Samuel de Vitry, author of the liturgical and ritual collection, <I>Mahzor Vitry.</I>[132] Among other disciples not so well known are Mattathias ben Moses, of Paris, Samuel ben Perigoros, Joseph ben Judah, and Jacob ben Simson (1123), who lived at Paris or Falaise and wrote Responsa at the dictation of his master, and, besides commentaries, a Mahzor, and an astronomic work. He was in turn the master of Jacob Tam. Judah ben Abraham, of Paris, aided by suggestions from his master, wrote a ceremonial for the Passover. In carrying out his task, he availed himself of the notes of his older fellow disciple Simhah, and his collaborator was Shemaiah, who had already worked on Rashi's commentary on Ezekiel. Besides, Shemaiah made additions to Rashi's Talmudic commentaries, and composed several commentaries under his guidance. He also collected and edited Rashi's Decisions and Responsa, serving, as it were, as Rashi's literary executor. Moreover, he was a relative of Rashi's, though the degree of kinship is not known, the evidence of authors upon the subject being contradictory. Some maintain he was Rashi's grandson, or son-in-law, or the son- in-law of his sister; according to others - and this seems more exact he was the father-in-law of a brother of Jacob Tam. At all events, it was Rashi's relatives who contributed most to his renown. "In regard to his family Rashi enjoyed unexampled good fortune," says Zunz. "It was not only through his disciples, but also through his family that the founder of rabbinical literature in France and Germany established his reputation, spread his works, and added to the lustre [luster sic] of his name." A fact which no doubt helped to assure the direction of the studies made by Rashi's descendants, is that they possessed the manuscripts written and corrected by their ancestor; and these autographs were veritable treasures at a time when books were rare and copies inexact. One of Rashi's sons-in-law, Judah ben Nathan,[133] was a scholarly and highly esteemed Talmudist. At the suggestion of his father-in-law, he completed Rashi's commentaries and continued the work after Rashi's death, using as his chief aid the oral explanations he had received from him. The son of Judah, Yomtob, was also a good Talmudist.