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The only book printed in Liady and the only work issued with the approbation of R. Shneur Zalman of Liady, the founder of Chabad.
R. Isaac b. Joseph of Corbeil (known as Semak after his main work; d. 1280), one of the great French codifiers of the 13th century; son-in-law of R. Jehiel of Paris. R. Isaac was renowned for his piety which is reflected in his Sefer Mitzvot Katan. His tosafot to several tractates are also referred to in rabbinic literature. R. Isaac's other writings include his "decisions," collated by one of his disciples from his responsa.