The most productive translators were Abu Zaid Honain ibn Ishaq (809?-873), his son, Ishaq ibn Honain († 910 or 911), and nephew Hobaish ibn al-Hasan. Seeing that they worked together, there is a good deal which is ascribed, now to the one and now to the other. Not a little material must have been prepared, under their oversight, by disciples and subordinates. Their activity extended over the whole range of the science of that day. Existing translations were improved, and new ones added. The father preferred to work at versions of medical authors, but the son turned more to the rendering of philosophical material. The work of the translators was still proceeding in the 10th century. Among those who especially distinguished themselves were Abu Bishr Matta ibn Yunus al-Qannai († 940), Abu Zakarya Yakhya ibn Adi al-Mantiqi († 974), Abu Ali Isa ibn Ishaq ibn Zura († 1008), and finally, Abu-l-Khair al-Hasan ibn al-Khammar (born 942), a pupil of Yakhya ibn Adi’s, of whose writings, besides translations, commentaries, and so forth, a tract is mentioned, on the Harmony between Philosophy and Christianity. From the time of Honain ibn Ishaq the activity of the translators was almost wholly confined to Aristotelian and Pseudo-Aristotelian writings, and to epitomes of them, to paraphrases of their contents and to commentaries upon them. 9. These translators are not to be regarded as specially great philosophers. Their work was seldom entered upon spontaneously, but almost always at the command of some Caliph or Vizir or other person of note. Outside of their own department of study, usually Medicine, they were chiefly interested in Wisdom,—that is, in pretty stories with a moral, in anecdotes, and in oracular sayings. The expressions which we merely bear with in intercourse, in narrative or on the stage, as being characteristic utterances with certain persons, were admired and collected by these worthy people for the sake of the wisdom contained in them, or perhaps even for no more than the rhetorical elegance of their form. As a rule, those men continued true to the Christian faith of their fathers. The traditional story of Ibn Djebril gives a good idea both of their way of thinking and of the liberal-mindedness of the Caliphs. When Mansur wanted to convert him to Islam, he is said to have replied: “In the faith of my fathers I will die: where they are, I wish also to be, whether in heaven or in hell”. Whereupon the Caliph laughed, and dismissed him with a rich present.